When comparing the atmosphere of the Earth and the Moon, the moon has a very thin atmosphere such that one can assume that the moon does not have an atmosphere. Or can say that the moon is surrounded by vacuum. We know that sound needs a medium to travel and cannot travel in a vacuum. This is the reason why Rani does not hear her friend Veena calling, even though she is near.
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Veena and Rani arTamilnadu - Science Term-3