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

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