Astronomy college course/Why planets lose their atmospheres/Quiz

AstroAtmosphericLoss_Study
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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 rplanet


 * ___ e) vescape is independent of matom

/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 rplanet


 * - e) vescape is independent of matom

/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.


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