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Mechanical Properties of Fluids
Question
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A spherical balloon is filled with: (i) CO2 and (ii) air. What type of lens will it behave for sound?

Answer

The velocity of sound in CO2 is less than in air. Therefore, spherical balloon filled with CO2 placed in air will act like a converging lens. While balloon filled with air placed in air will not act like any lens. 

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