An underwater sonar source operating at a frequency of 60 KHz directs its beam towards the surface. If the velocity of sound in air is 330 m/s, the wavelength and frequency of waves in air are:

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5.5 mm, 60 KHz

330 m, 60 KHz

5.5 mm, 20 KHz

5.5 mm, 80 KHz

answer is A.

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Detailed Solution

Frequency of waves remains same, i.e. 60 Hz and wavelength λ=vn=33060×103= 5.5 mm.

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