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A balloon is filled with CO(2). How will...

A balloon is filled with `CO_(2)`. How will it behave as a lens for sound waves? What happens if `CO_(2)` is replaced by hydrogen?

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A balloon filled with `CO_(2)` behaves like a convex lens. This is because, velocity of sound in `CO_(2)` is less than that in air. When `CO_(2)` is replaced by hydrogen, the balloon behaves as a concave lens as velocity of sound in hydrogen is greater than that in air.
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