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Gravitation — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceGravitation2 Marks
Question
Why moon does not have an atmosphere$?$
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Answer

Moon does not have atmosphere because the value of escape velocity on moon is $2.3\ km$ per second but the average velocity of particles of gas is $2.5\ km$ per second so it is not possible on moon to have its atmosphere because all gaseous particles with escape from the Moon surface.

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