Astronomy college course/Why planets lose their atmospheres/Quiz

AstroAtmosphericLoss_Study

WHY THIS PAGE IS PROTECTED - Original version of this quiz

If you are reading this as a Wikiversity page, proper pagebreaks should result if printed using your browser's print option, usually located in the upper right portion of your screen. But, pagebreaks do not render properly if you use "Printable version" on Wikiversity's Print/export option on the left-hand sidebar. Attribution for the quizzes, and study links are at the end of this document.

AstroAtmosphericLoss_Study-v1s1

1. It is important to distinguish between molecules (collectively) in a gas and one individual molecule. This question is about an individual molecule. For a planet with a given mass, size, and density, which has the greater escape velocity?

___ a) all molecules have the same escape velocity

___ b) the heavier molecule has the greater escape velocity

___ c) all molecules move at the escape velocity

___ d) no molecules have escape velocity

___ e) the lighter molecule has the greater escape velocity

2. It is important to distinguish between molecules (collectively) in a gas and one individual molecule. This question is about a typical molecule in the gas. For a planet with a given mass, size, and density, which type of gas is more likely to escape?

___ a) atoms in a denser gas are more likely to escape

___ b) atoms in a colder gas are more likely to escape

___ c) all types of gas are equally likely to escape

___ d) atoms in a gas with more atomic mass are more likely to escape

___ e) atoms in a hotter gas is more likely to escape

3. Which type of gas is likely to have the faster particles?

___ a) a cold gas with low mass atoms

___ b) a hot gas with low mass atoms

___ c) a cold gas with high mass atoms

___ d) a hot gas with high mass atoms

___ e) all gasses on a given planet have the same speed

4. What is it about the isotopes of Argon-36 and Argon-38 that causes their relative abundance to be so unusual on Mars?

___ a) different chemical properties

___ b) different half-life

___ c) identical abundance

___ d) different speed

___ e) identical mass

5. In the formula, ${\frac {1}{2}}m_{\mathrm {atom} }v_{\mathrm {escape} }^{2}=G_{\mathrm {Newton} }{\frac {M_{\mathrm {planet} }m_{\mathrm {atom} }}{r_{\mathrm {planet} }}}$, which of the following is FALSE?

___ a) the formula can be used to estimate how fast an atom must move before exiting the planet

___ b) the formula is valid for all launch angles

___ c) the particle is assumed to have been launched vertically

___ d) the formula is valid only if the particle is launched from the surface of planet of radius r_planet

___ e) v_escape is independent of m_atom

6. What statement is FALSE about ${\frac {1}{2}}m_{\mathrm {atom} }\langle v_{\mathrm {atom} }^{2}\rangle _{ave}={\frac {1}{2}}k_{\mathrm {B} }T$?

___ a) The average speed of a low mass particle is higher than the average speed of a high mass particle

___ b) This equation does not involve the size or mass of the planet.

___ c) Temperature is measured in Kelvins

___ d) Temperature is measured in Centigrades

___ e) The kinetic energy is directly proportional to temperature.

7. ${\frac {1}{2}}m_{\mathrm {atom} }\langle v_{\mathrm {atom} }^{2}\rangle _{ave}={\frac {1}{2}}k_{\mathrm {B} }T$, where T is temperature on the Kelvin scale. This formula describes:

___ a) The speed of a typical atom, where m is the mass of the planet.

___ b) The the speed an atom needs to escape the planet, where m is the mass planet.

___ c) The speed an atom needs to orbit the planet, where m is the mass of the atom.

___ d) The speed an atom needs to escape the planet, where m is the mass of the atom.

___ e) The speed of a typical atom, where m is the mass of the atom.

Key to AstroAtmosphericLoss_Study-v1s1

1. It is important to distinguish between molecules (collectively) in a gas and one individual molecule. This question is about an individual molecule. For a planet with a given mass, size, and density, which has the greater escape velocity?

+ a) all molecules have the same escape velocity

- b) the heavier molecule has the greater escape velocity

- c) all molecules move at the escape velocity

- d) no molecules have escape velocity

- e) the lighter molecule has the greater escape velocity

2. It is important to distinguish between molecules (collectively) in a gas and one individual molecule. This question is about a typical molecule in the gas. For a planet with a given mass, size, and density, which type of gas is more likely to escape?

- a) atoms in a denser gas are more likely to escape

- b) atoms in a colder gas are more likely to escape

- c) all types of gas are equally likely to escape

- d) atoms in a gas with more atomic mass are more likely to escape

+ e) atoms in a hotter gas is more likely to escape

3. Which type of gas is likely to have the faster particles?

- a) a cold gas with low mass atoms

+ b) a hot gas with low mass atoms

- c) a cold gas with high mass atoms

- d) a hot gas with high mass atoms

- e) all gasses on a given planet have the same speed

4. What is it about the isotopes of Argon-36 and Argon-38 that causes their relative abundance to be so unusual on Mars?

- a) different chemical properties

- b) different half-life

- c) identical abundance

+ d) different speed

- e) identical mass

5. In the formula, ${\frac {1}{2}}m_{\mathrm {atom} }v_{\mathrm {escape} }^{2}=G_{\mathrm {Newton} }{\frac {M_{\mathrm {planet} }m_{\mathrm {atom} }}{r_{\mathrm {planet} }}}$, which of the following is FALSE?

- a) the formula can be used to estimate how fast an atom must move before exiting the planet

+ b) the formula is valid for all launch angles

- c) the particle is assumed to have been launched vertically

- d) the formula is valid only if the particle is launched from the surface of planet of radius r_planet

- e) v_escape is independent of m_atom

6. What statement is FALSE about ${\frac {1}{2}}m_{\mathrm {atom} }\langle v_{\mathrm {atom} }^{2}\rangle _{ave}={\frac {1}{2}}k_{\mathrm {B} }T$?

- a) The average speed of a low mass particle is higher than the average speed of a high mass particle

- b) This equation does not involve the size or mass of the planet.

- c) Temperature is measured in Kelvins

+ d) Temperature is measured in Centigrades

- e) The kinetic energy is directly proportional to temperature.

7. ${\frac {1}{2}}m_{\mathrm {atom} }\langle v_{\mathrm {atom} }^{2}\rangle _{ave}={\frac {1}{2}}k_{\mathrm {B} }T$, where T is temperature on the Kelvin scale. This formula describes:

- a) The speed of a typical atom, where m is the mass of the planet.

- b) The the speed an atom needs to escape the planet, where m is the mass planet.

- c) The speed an atom needs to orbit the planet, where m is the mass of the atom.

- d) The speed an atom needs to escape the planet, where m is the mass of the atom.

+ e) The speed of a typical atom, where m is the mass of the atom.

Attribution (for quiz questions) under CC-by-SA license

http://en.wikiversity.org/w/index.php?title=Astronomy_college_course/Why_planets_lose_their_atmospheres/questions&oldid=1204943

Study guide

http://en.wikiversity.org/w/index.php?title=Astronomy_college_course/Why_planets_lose_their_atmospheres&oldid=1388258