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Why does Moon have no atmosphere?...

Why does Moon have no atmosphere?

Text Solution

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Moon has no atmosphere because the value of acceleration due to gravity 'g' on surface of Moon is small. Therefore, the value of escape speed on the surface of Moon is small (only `2.5 km s^(-1))`. The molecules of the atmospheric gases on the surface of the Moon have thermal speeds greater than the escape speed. that is why all the molecules of gases have escaped and there is no atmosphere on Moon.
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Knowledge Check

  • The Moon has no atmosphere because

    A
    acceleration due to gravity on the surface of the moon is greater than that on the surface of the earth.
    B
    it is far away from the earth.
    C
    it is not a planet.
    D
    the escape velocity on its surface is very small.

  • Assertion : Moon has no atmosphere. Reason : The escape velocity for moon is less than that for earth.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion
    B
    If both assertion and reason are truebut reason is not the correct explanation of assertion
    C
    If assertion is true but reason is false
    D
    If both assertion and reason are false.

  • Assertion : Two persons on the surface of moon cannot talk to each other. Reason : There is no atmosphere on the moon.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
    C
    If assertion is true but reason is false.
    D
    If both assertion and reason are false.

    • Similar Questions

    Explore conceptually related problems

    If the earth did not have an atmosphere, it would become intoleraby cold. Why?

    Escape velocity from the surface of moon is less than that from the surface of earth because the moon has no atmosphere while earth has a very dense one.

    Why does the atmospheric pressure go on decreasing as we go higher up above the earths' surface?

    Assertion : Two persons on the surface of moon cannot talk to each other. Reason : There is no atmosphere on moon.

    Assertion : Two person on the surface of the moon cannot talk to each other. Reason : There is no atmosphere on moon.

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