Astronomy | Geophysics homework help

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1. Matching: How do astronomers determine the physical characteristics of stars? Match each characteristic of stars with an important technique that astronomers use to determine that characteristic. Refer to Table 18.2 and page 660 in Chapter 19 when answering this question. Each answer will be used once.

How do Astronomers determine the …

of a star?

Technique

Surface temperature

Radial Velocity

Mass

Diameter

Luminosity

Distance

Techniques for Question 1: Measure the apparent brightness and determine the distance to the star / Measure the Doppler shift / Measure the light curves and Doppler shifts for eclipsing binary stars / Measure the star’s parallax / Measure the peak wavelength of the star’s spectrum and apply Wien’s Law / Measure the period and radial velocity curves for spectroscopic binary stars

2. Matching: (Review Question 4 on page 682 in OSA) Which method would you use to obtain the distance to each of the following? Choose the best answer below:

Method

A. An asteroid crossing Earth’s orbit

B. A star astronomers believe to be no more than 50 light-years from the Sun

C. A tight group of stars in the Milky Way Galaxy that includes a significant number of variable stars.

D. A star that is not variable but for which you can obtain a clearly defined spectrum.

Methods for Question 2: RR Lyrae and/or Cepheid variable stars can be used to determine the distance / Measure the parallax of the object and calculate the distance by triangulation / The information you have is sufficient to allow you to place the star in the correct location on the H-R diagram; this allows you to accurately estimate the object’s luminosity and, using the inverse-square law, its distance / Send a radar beam toward the object and measure the return time

†3. (Review Question 5 on page 682 in OSA) What are the luminosity class and spectral type of a star with an effective temperature of 5000 K and a luminosity of 100 Lsun?

A. First, calculate the radius of the star relative to the Sun using the equation L*/Lsun = (R*/Rsun)2 (T*/Tsun)4. The radius of this star is ( 1/100 times / 1/10 times / 1/5.5 times / the same as / 10 times / 13.5 times / 100 times) the radius of the Sun.

B. The luminosity class of this star is ( Ia / Ib / II / III / IV / V / wd ). This indicates that it is a ( Bright Supergiant / Less Luminous Supergiant / Bright Giant / Giant / Subgiant / Main Sequence / White Dwarf ) star. If you need help, refer to page 676 in OSA.

C. The spectral type of this star is ( O / B / A / F / G / K / M ). If you need help, refer to Table 17.2 on page 601 in OSA.

†4. What are the spectral type and luminosity class of the star Regulus which has a surface temperature of 10,750 K and a luminosity of 220 Lsun? Regulus is in the constellation Leo and represents the Lion’s Heart.

A. First, calculate the radius of Regulus relative to the Sun using the equation L*/Lsun = (R*/Rsun)2 (T*/Tsun)4. The radius of the star Regulus is ( 1/220 times / 1/20 times / 1/13.5 times / the same as / 4.3 times / 20 times / 220 times) the radius of the Sun.

B. The spectral type of this star is ( O / B / A / F / G / K / M ). If you need help, refer to Table 17.2 on page 601 in OSA.

C. The luminosity class of this star is ( Ia / Ib / II / III / IV / V / wd ). This indicates that it is a ( Bright Supergiant / Less Luminous Supergiant / Bright Giant / Giant / Subgiant / Main Sequence / White Dwarf ) star. This is not easy to interpret using Figure 19.15 in OSA. I recommend that, instead, you determine where Regulus would plot on the H-R diagram we used for questions 7 and 8 on the Chapter 18 homework; this version is easier to interpret because it is contoured in terms of solar diameters.

†5. (Thought Question 18 on page 683 in OSA) A G2 star has a luminosity 100 times that of the Sun. What kind of star is it? How does its radius compare to that of the Sun? Refer to Figure 19.15 when answering part A of this question.

A. The luminosity class of this star is ( Ia / Ib / II / III / IV / V / wd ); it is a ( Bright Supergiant / Less Luminous Supergiant / Bright Giant / Giant / Subgiant / Main Sequence / White Dwarf ) star.

B. The radius of this star is ( 1/100 times / 1/10 times / the same as / 10 times / 100 times ) that of the Sun.

†6. (Thought Question 19 on page 683 in OSA) A star has a temperature of 10,000 K and a luminosity 10-2 Lsun. What kind of star is it? Refer to Figure 19.15 when answering this question.

The luminosity class of this star is ( Ia / Ib / II / III / IV / V / wd ); it is a ( Bright Supergiant / Less Luminous Supergiant / Bright Giant / Giant / Subgiant / Main Sequence / White Dwarf ) star.

7. (Thought Question 20 on page 683 in OSA) What is the advantage of measuring a parallax distance to a star as compared to our other distance measuring methods?

a. Results from the parallax method can be directly compared to results from measuring the periods of Cepheid variable stars since there are a number of these stars located close to our Solar System.

b. Distances calculated by the parallax method do not rely on any assumptions made about the star; these distances depend only on geometric calculations.

c. As long as a clear spectrum of the star can be obtained, its distance can be calculated using the parallax method.

8. (Thought Question 21 on page 683 in OSA) What is the disadvantage of the parallax method, especially for studying distant parts of the Galaxy? The parallax method can only be used ______.

a. for stars that are relatively close to us in the Milky Way Galaxy.

b. if a clear spectrum of the star can be obtained.

c. if the star of interest is part of a binary system.

d. if the star of interest is a particular type of variable star.

9. (Thought Question 24 on page 683 in OSA) Why would it be easier to measure the characteristics of intrinsically less luminous Cepheids than more luminous ones?

The relationship that pertains specifically to Cepheid variable stars is the ( Hertzsprung-Russell / period-luminosity / mass-luminosity / Stefan-Boltzmann ) relationship. Hence, the most important characteristic that astronomers want to measure for a Cepheid variable star is ( its surface temperature / its Doppler shift / its absorption lines / the period of its light curve ). It would be easier to make this measurement for a less luminous Cepheid because ( it is easier to measure low surface temperatures rather than high surface temperatures / these have a greater Doppler shift / they have stronger absorption lines / the period for less-luminous Cepheids is shorter making it easier to measure).

10. When Henrietta Leavitt discovered the period-luminosity relationship, she used Cepheid variable stars that were all located in the Large Magellanic Cloud (LMC). It was (easier / more difficult ) to compare Cepheids in the LMC rather than those located in the Milky Way Galaxy because they are all ( about the same distance away / located at widely varying distances from Earth ). As a result ( differences in apparent brightness are directly related to differences in intrinsic brightness of these stars / all of these stars have the same Doppler shift / all of these stars have the same proper motion ).

†11. (Figuring for Yourself Question 28 on page 684 in OSA) Estimate the minimum and maximum time it takes a radar signal to make the round trip between Earth and Venus, which has a semimajor axis of 0.72 AU. Hint: draw a diagram! See the one-slide PowerPoint titled “Superior and Inferior Conjunctions” if you need help.

The minimum distance between the Earth and Venus (inferior conjunction) is _____ AU. Your answer should be in the format x.xx.

The maximum distance between the Earth and Venus (superior conjunction) is _____ AU. Your answer should be in the format x.xx.

How long does it take a radar signal to make the round trip between the Earth and Venus when Venus is at its minimum distance from Earth (inferior conjunction)? It takes a radar signal ____ minutes and ____ seconds to travel between the Earth and Venus and back when they are at their minimum possible distance apart. Enter a whole number in each blank; the number in the second blank should be less than 60.

How long does it take a radar signal to make the round trip between the Earth and Venus when Venus is at its maximum distance from Earth (superior conjunction)? It takes a radar signal ____ minutes and ____ seconds to travel between the Earth and Venus and back when they are at their maximum possible distance apart. Enter a whole number in each blank; the number in the second blank should be less than 60.

†12. (Figuring for Yourself Questions 38 and 39 on page 684 in OSA) The most recently discovered system close to Earth is a pair of brown dwarfs known as Luhman 16. It has a distance of 6.5 light years.

A. How many parsecs is this? _______ parsecs. Round your answer to the nearest whole number.

B. What would the parallax of Luhman 16 be as measured from Earth? The parallax of Luhman 16 is ______ arcseconds. You may enter your answer as a fraction or a decimal number.

†13. The star Fomalhaut is 25 light-years from us. What is this distance in parsecs? ____ parsecs; your answer should be in the format x.x. What would be the parallax of Fomalhaut? ______ arcseconds; give your answer in the format x.xx

†14. Star A has a parallax of 0.4 seconds of arc, while star B has a parallax of 0.06 seconds of arc. Which star is closer? Star A is ( closer to / farther from ) Earth than Star B.

Star A has a parallax of 0.4 seconds of arc. Star A is ( 0.06 / 0.4 / 1.3 / 2.5 / 5 / 10.6 / 16.7 ) ( parsecs / light-years) from Earth.

Star B has a parallax of 0.06 seconds of arc. Star B is ( 0.06 / 0.4 / 1.3 / 2.5 / 5 / 10.6 / 16.7 ) ( parsecs / light-years) from Earth.

†15. The parallax of the star Regulus is 0.042 arcseconds. What is the distance to Regulus in parsecs? ______ parsecs; your answer should be in the format xx.x. What is the distance to Regulus in light-years? ______ light-years; round your answer to the nearest whole number.

†16. (Question 40 from A. Frank, 2016, page 103) Two stars are known to have the same luminosity, but one appears one-sixteenth (1/16) as bright as the other. How many more times distant is the dimmer star?

The dimmer star is ____ times more distant than the brighter star. Enter a whole number in the blank.

†17. (Question 41 from A. Frank, 2016, page 103) Star A is 9 times as far away as star B. Both appear to have the same brightness. What is the ratio of the luminosity of star A to that of star B?

Star A is ____ times as luminous as star B. Enter a whole number in the blank.

18. (Figuring for Yourself Question 41 on page 684 in OSA) What physical properties are different for an M giant with a luminosity of 1000 Lsun and an M dwarf with a luminosity of 0.5 Lsun? What physical properties are the same? Place “same” or “different” in each blank.

Surface temperature

Diameter

Luminosity

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July 1, 2023

Question 1 of 20

Darcy and Chloe have spent most of the morning building a large road and bridge leading from the block center to the book corner. The other students have made several comments about the “cool” bridge, asking if they can help build. Mrs. Harold has insisted that the blocks must be moved back to the block area. Chances are this is __________ problem.

A. Mrs. Harold’s

B. Darcy’s

C. Chloe’s

D. no one’s

Question 2 of 20

Sierra, a kindergarten student, is no longer willing to share anything aloud at circle time. She has become withdrawn and sad. Her parents have recently separated and are fighting over custody. What is the most likely cause of Sierra’s behavior?

A. Unmet emotional needs

B. Age-typical behavior

C. Inappropriate adult expectations

D. Lack of social skills

Question 3 of 20

Carl is getting tired of two children in his three-year-old room having wetting accidents on the playground. The class always uses the restroom before they go outside, but two of the boys are wetting themselves at least once a week, making Carl have to send them inside for clean clothes. He has tried talking to their parents and giving them stickers for days when they are dry at the end of playtime, but nothing seems to work. Think about the cause of this problem and choose the best solution.

A. Use related consequences

B. Give attention only for desirable behavior

C. Get outside help

D. Change adult attitude

Question 4 of 20

If a child is unable to connect to others because her parents do not show her love and acceptance, what would be the appropriate solution for this situation?

A. Change adult expectations.

B. Help the child get her needs met.

C. Get outside help.

D. Use related consequences.

Question 5 of 20

The first step to reaching long term discipline goals is to:

A. set specific consequences for specific behaviors.

B. set up a reward program.

C. determine the cause of the behavior.

D. determine the desired results of the discipline plan.

Question 6 of 20

If a child is having outbursts because of a serious emotional problem, what would be the appropriate solution to the problem?

A. Change adult expectations.

B. Help the child get his needs met.

C. Get outside help.

D. Use related consequences.

Question 7 of 20

When exercising your judgment in a discipline situation, which should you do first?

A. Ask yourself, “What else do I know about this child?”

B. Ask yourself, “What are my goals for discipline?”

C. Count to 10.

D. Remove the child from the situation.

Question 8 of 20

Reflective listening is useful when the problem is of a __________ nature.

A. social/emotional

B. physical

C. intellectual

D. None of the above

Question 9 of 20

Lilly just started day care today. When her teacher turned on the “clean up song” all of the other 3-year-olds began to sing and put their toys away, but Lilly just continued playing. Lilly is displaying:

A. a lack of social skills.

B. inappropriate adult expectations.

C. unmet emotional needs.

D. a lack of understanding.

Question 10 of 20

A child has just disrupted group time for the third time, and you are unable to come up with an appropriate response. The best response is to:

A. move the child to your lap for the remainder of group time.

B. explain to the child that you need time to think about the situation.

C. send the child to his seat until group time is over.

D. ask all of the children to return to their seats since group time is not working well.

Question 11 of 20

Discipline problems that are a result of unmet needs should be dealt with through:

A. attempts to meet the child’s needs.

B. related consequences.

C. Both a and b

D. Neither a nor b

Question 12 of 20

Discipline that deals with a behavior rather than the cause of that behavior:

A. is doomed to failure.

B. is one effective method out of many.

C. is a good place to start with very young children.

D. works best in an emergency situation.

Question 13 of 20

Mr. White hears Brian yelling loudly across the room for his friend James. Mr. White quietly walks over to Brian and whispers to him the rule about quiet voices inside. Mr. White knows that the noise level in the classroom has been elevated lately, mainly due to him becoming rather relaxed about talking loudly himself. To help Brian and the other children correct these behaviors, which one of the related solutions below would be best?

A. Change adult expectations

B. Model desired behavior

C. Change adult attitude

D. Use related consequences

Question 14 of 20

As Miss Margaret firmly pries twenty-two-month-old Gary’s clenched fingers one-by-one out of another child’s hair, she says with a concerned tone, “Ouch! Pulling hurts. No pulling. Touch gently, please!” Miss Margaret did not punish Gary because she realizes that Gary behaved this way due to:

A. lack of understanding.

B. lack of communication skills.

C. mislearning from models.

D. unmet emotional needs.

Question 15 of 20

If a child is displaying an inappropriate behavior because he does not understand why the behavior is inappropriate, what related solution should be used?

A. Change adult expectations.

B. Help the child get his needs met.

C. Change adult attitude.

D. Use related consequences.

Question 16 of 20

Mislearning causes much undesirable behavior. Sometimes mislearning is caused by accidental reinforcement of inappropriate behavior and sometimes mislearning is caused by:

A. lack of understanding.

B. lack of social skills.

C. inappropriate role models.

D. inappropriate age-typical behavior.

Question 17 of 20

Mrs. Brown is feeling a bit irritated by the noise level in her 1st grade classroom. She put all of the students into cooperative groups to work on a social studies project. The room is slightly more noisy then she likes, but when she looks around she sees that all of the children are engaged in active learning and all of the groups are being productive. What might be the best solution to Mrs. Brown’s problem?

A. Change adult expectations

B. Model desired behavior

C. Change adult attitude

D. Use related consequences

Question 18 of 20

If a child is perfectly content with a situation and the teacher is the unhappy one, it is likely the teacher owns the problem. When this is the case, the approaches a teacher can take are to express “I messages,” change expectations, change the environment, remove himself/herself, or:

A. get outside help.

B. use related consequences.

C. change the curriculum.

D. model the desired behavior.

Question 19 of 20

ALL Children need a nurturing teacher, a flexible classroom environment, a challenging curriculum, and:

A. competition.

B. toys.

C. friends.

D. books.

Question 20 of 20

Ms. Wiggs is trying to read a story about elephants before her first grade class leaves that morning for a trip to the local zoo. The children have already sat through calendar and weather time, as well as a sharing time on what they would see at the zoo that day. The children are starting to get restless and some are poking at each other. Mrs. Wiggs is beginning to lose her patience. What is the possible cause of the children’s behavior?

A. Lack of social skills

B. Inappropriate adult expectations

C. Unmet emotional needs

D. Lack of understanding

July 1, 2023

Question 1 of 20

A. Mrs. Harold’s

B. Darcy’s

C. Chloe’s

D. no one’s

Question 2 of 20

A. Unmet emotional needs

B. Age-typical behavior

C. Inappropriate adult expectations

D. Lack of social skills

Question 3 of 20

A. Use related consequences

B. Give attention only for desirable behavior

C. Get outside help

D. Change adult attitude

Question 4 of 20

If a child is unable to connect to others because her parents do not show her love and acceptance, what would be the appropriate solution for this situation?

A. Change adult expectations.

B. Help the child get her needs met.

C. Get outside help.

D. Use related consequences.

Question 5 of 20

The first step to reaching long term discipline goals is to:

A. set specific consequences for specific behaviors.

B. set up a reward program.

C. determine the cause of the behavior.

D. determine the desired results of the discipline plan.

Question 6 of 20

If a child is having outbursts because of a serious emotional problem, what would be the appropriate solution to the problem?

A. Change adult expectations.

B. Help the child get his needs met.

C. Get outside help.

D. Use related consequences.

Question 7 of 20

When exercising your judgment in a discipline situation, which should you do first?

A. Ask yourself, “What else do I know about this child?”

B. Ask yourself, “What are my goals for discipline?”

C. Count to 10.

D. Remove the child from the situation.

Question 8 of 20

Reflective listening is useful when the problem is of a __________ nature.

A. social/emotional

B. physical

C. intellectual

D. None of the above

Question 9 of 20

A. a lack of social skills.

B. inappropriate adult expectations.

C. unmet emotional needs.

D. a lack of understanding.

Question 10 of 20

A child has just disrupted group time for the third time, and you are unable to come up with an appropriate response. The best response is to:

A. move the child to your lap for the remainder of group time.

B. explain to the child that you need time to think about the situation.

C. send the child to his seat until group time is over.

D. ask all of the children to return to their seats since group time is not working well.

Question 11 of 20

Discipline problems that are a result of unmet needs should be dealt with through:

A. attempts to meet the child’s needs.

B. related consequences.

C. Both a and b

D. Neither a nor b

Question 12 of 20

Discipline that deals with a behavior rather than the cause of that behavior:

A. is doomed to failure.

B. is one effective method out of many.

C. is a good place to start with very young children.

D. works best in an emergency situation.

Question 13 of 20

A. Change adult expectations

B. Model desired behavior

C. Change adult attitude

D. Use related consequences

Question 14 of 20

A. lack of understanding.

B. lack of communication skills.

C. mislearning from models.

D. unmet emotional needs.

Question 15 of 20

If a child is displaying an inappropriate behavior because he does not understand why the behavior is inappropriate, what related solution should be used?

A. Change adult expectations.

B. Help the child get his needs met.

C. Change adult attitude.

D. Use related consequences.

Question 16 of 20

Mislearning causes much undesirable behavior. Sometimes mislearning is caused by accidental reinforcement of inappropriate behavior and sometimes mislearning is caused by:

A. lack of understanding.

B. lack of social skills.

C. inappropriate role models.

D. inappropriate age-typical behavior.

Question 17 of 20

A. Change adult expectations

B. Model desired behavior

C. Change adult attitude

D. Use related consequences

Question 18 of 20

A. get outside help.

B. use related consequences.

C. change the curriculum.

D. model the desired behavior.

Question 19 of 20

ALL Children need a nurturing teacher, a flexible classroom environment, a challenging curriculum, and:

A. competition.

B. toys.

C. friends.

D. books.

Question 20 of 20

A. Lack of social skills

B. Inappropriate adult expectations

C. Unmet emotional needs

D. Lack of understanding

July 1, 2023

Question 1 of 20

A. Mrs. Harold’s

B. Darcy’s

C. Chloe’s

D. no one’s

Question 2 of 20

A. Unmet emotional needs

B. Age-typical behavior

C. Inappropriate adult expectations

D. Lack of social skills

Question 3 of 20

A. Use related consequences

B. Give attention only for desirable behavior

C. Get outside help

D. Change adult attitude

Question 4 of 20

If a child is unable to connect to others because her parents do not show her love and acceptance, what would be the appropriate solution for this situation?

A. Change adult expectations.

B. Help the child get her needs met.

C. Get outside help.

D. Use related consequences.

Question 5 of 20

The first step to reaching long term discipline goals is to:

A. set specific consequences for specific behaviors.

B. set up a reward program.

C. determine the cause of the behavior.

D. determine the desired results of the discipline plan.

Question 6 of 20

If a child is having outbursts because of a serious emotional problem, what would be the appropriate solution to the problem?

A. Change adult expectations.

B. Help the child get his needs met.

C. Get outside help.

D. Use related consequences.

Question 7 of 20

When exercising your judgment in a discipline situation, which should you do first?

A. Ask yourself, “What else do I know about this child?”

B. Ask yourself, “What are my goals for discipline?”

C. Count to 10.

D. Remove the child from the situation.

Question 8 of 20

Reflective listening is useful when the problem is of a __________ nature.

A. social/emotional

B. physical

C. intellectual

D. None of the above

Question 9 of 20

A. a lack of social skills.

B. inappropriate adult expectations.

C. unmet emotional needs.

D. a lack of understanding.

Question 10 of 20

A child has just disrupted group time for the third time, and you are unable to come up with an appropriate response. The best response is to:

A. move the child to your lap for the remainder of group time.

B. explain to the child that you need time to think about the situation.

C. send the child to his seat until group time is over.

D. ask all of the children to return to their seats since group time is not working well.

Question 11 of 20

Discipline problems that are a result of unmet needs should be dealt with through:

A. attempts to meet the child’s needs.

B. related consequences.

C. Both a and b

D. Neither a nor b

Question 12 of 20

Discipline that deals with a behavior rather than the cause of that behavior:

A. is doomed to failure.

B. is one effective method out of many.

C. is a good place to start with very young children.

D. works best in an emergency situation.

Question 13 of 20

A. Change adult expectations

B. Model desired behavior

C. Change adult attitude

D. Use related consequences

Question 14 of 20

A. lack of understanding.

B. lack of communication skills.

C. mislearning from models.

D. unmet emotional needs.

Question 15 of 20

If a child is displaying an inappropriate behavior because he does not understand why the behavior is inappropriate, what related solution should be used?

A. Change adult expectations.

B. Help the child get his needs met.

C. Change adult attitude.

D. Use related consequences.

Question 16 of 20

Mislearning causes much undesirable behavior. Sometimes mislearning is caused by accidental reinforcement of inappropriate behavior and sometimes mislearning is caused by:

A. lack of understanding.

B. lack of social skills.

C. inappropriate role models.

D. inappropriate age-typical behavior.

Question 17 of 20

A. Change adult expectations

B. Model desired behavior

C. Change adult attitude

D. Use related consequences

Question 18 of 20

A. get outside help.

B. use related consequences.

C. change the curriculum.

D. model the desired behavior.

Question 19 of 20

ALL Children need a nurturing teacher, a flexible classroom environment, a challenging curriculum, and:

A. competition.

B. toys.

C. friends.

D. books.

Question 20 of 20

A. Lack of social skills

B. Inappropriate adult expectations

C. Unmet emotional needs

D. Lack of understanding

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