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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?

Answer»

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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