Explain why

(a) There is no atmosphere on moon.

(b) There is fall in temperature with altitude. 13.28 Consider an ideal gas with following distribution of speeds

(i) Calculate Vrms and hence T. 26 ( 3.0 10 kg) m − = ×

(ii) If all the molecules with speed 1000 m/s escape from the system, calculate new V_rms and hence T.

This is a long answer type question as classified in NCERT Exemplar

(a) The moon has small gravitational force and hence, the escape velocity is small .

As the moon in the proximity of the earth as seen from the sun, the moonhas the same amount of heat per unit area as that of the earth.

The air molecules have large range of speeds . even though the rms speed of the air molcules is smaller than the escape velocity on the moon, a significant number of molecules have speed grater than the escape velocity.

(b) As the molecules move higher their potential energy increases and hence kinetic energy decreases and hence temperature reduces. At g

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This is a long answer type question as classified in NCERT Exemplar

(a) The moon has small gravitational force and hence, the escape velocity is small .

As the moon in the proximity of the earth as seen from the sun, the moonhas the same amount of heat per unit area as that of the earth.

The air molecules have large range of speeds . even though the rms speed of the air molcules is smaller than the escape velocity on the moon, a significant number of molecules have speed grater than the escape velocity.

(b) As the molecules move higher their potential energy increases and hence kinetic energy decreases and hence temperature reduces. At greater height more volume is available and gas expands and hence some cooling takes place.

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<p><span data-teams="true">This is a long answer type question as classified in NCERT Exemplar</span></p><p><strong> (a)</strong> The moon has small gravitational force and hence, the escape velocity is small .</p><p>As the moon in the proximity of the earth as seen from the sun, the moonhas the same amount of heat per unit area as that of the earth.</p><p>The air molecules have large range of speeds . even though the rms speed of the air molcules is smaller than the escape velocity on the moon, a significant number of molecules have speed grater than the escape velocity.</p><div><div><picture><source srcset="https://images.shiksha.com/mediadata/images/articles/1745558044phpD9pzGC_480x360.jpeg" media=" (max-width: 500px)"><img src="https://images.shiksha.com/mediadata/images/articles/1745558044phpD9pzGC.jpeg" alt="" width="1200" height="675"></picture></div></div><p><strong> (b)</strong> As the molecules move higher their potential energy increases and hence kinetic energy decreases and hence temperature reduces. At greater height more volume is available and gas expands and hence some cooling takes place.</p>

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