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Q.

A sound tone is produced under water. When it enters air

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a

its frequency and wavelength increase

b

Wave length decreases and frequency does not change

c

Wave length increases and frequency does not change

d

its frequency and wavelength decrease

answer is C.

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Detailed Solution

The speed of sound is more in water as compared to in air.

v∝λ 

The frequency remains same so both speed and wavelength decrease in air.

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