26.Which of the following condition will be true for a planet to have atmosphere? [A] velocity of molecules in its atmosphere is lesser than escape velocity [B] velocity of molecules in its atmosphere is greater than escape velocity [C] velocity of molecules in its atmosphere is twice the escape velocity [D] velocity of molecules in its atmosphere is equal to the escape velocity Show Answer
Notes: A planet will have atmosphere if the velocity of molecule in its atmosphere is lesser than escape velocity. This is why earth has atmosphere while moon has no atmosphere.
