5 a) and b) account for the following
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a) to escape into infinite space earth's atmosphere has need to posses minimum amount of energy and the escape velocity . The escape velocity is depend upon mass and radius as V(escape) = √GM/R . so the particles of atmosphere has low velocity then escape velocity of earth (11.2 km/s) .
b) while in case of moon value of M and r decreases and the value of escape velocity decreases the velocity of gases , other particles of moon is more than it s escape velocity so it has no atmosphere .
b) while in case of moon value of M and r decreases and the value of escape velocity decreases the velocity of gases , other particles of moon is more than it s escape velocity so it has no atmosphere .
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