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

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

(a) 5.5mm, 60 kHz

(b) 5.5mm, 30 kHz

(c) 5.5mm, 30 kHz

(d) 5.5mm, 80 kHz

I have been asked this question in final exam.

My question is based upon Sounds and Waves topic in chapter Waves of Engineering Physics I

1 Answer

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Right answer is (a) 5.5mm, 60 kHz

For explanation: Frequency in air will also be 60 kHz

ʎa=va/γ=330/(60×10^3)=5.5×10^-3 m

=5.5mm.

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