1.

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:  [DPMT 2004]

A. 5.5 mm, 60 KHz 
B. 330 m, 60 KHz
C. Velocity    
D. 5.5 mm, 80 KHz
Answer» B. 330 m, 60 KHz


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