What is the diameter at given altitudes, Physics

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What is the diameter at given altitudes

A child loses his balloon, which rises slowly into the sky. If the balloon is 16 cm in diameter when the child loses it, what is its diameter at the following altitudes? Assume that the balloon is very flexible and so surface tension can be neglected.

(a)1500m

(b)2100m

(c) 5000 m

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