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If a balloon if filled with CO^2 gas, then how will it behave as a lens for sound waves? If it were filled with hydrogen gas, then what will happen?

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If a balloon if filled with CO2 gas, then how will it behave as a lens for sound waves? If it were filled with hydrogen gas, then what will happen?

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Velocity of sound in CO2 is less than that in air. Therefore balloon will behave as a convex lens for sound waves. In hydrogen, velocity of sound is greater than that in air. Therefore, balloon filled with hydrogen will behave as a concave lens.

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