Multiple choice question XXXVI — task. Science CBSE, Class 9.

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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:

$5.5\ mm$ , $60\ kHz$
$5.5\ mm$ , $20\ kHz$
$5.5\ mm$ , $80\ kHz$
$330\ mm$ , $60\ kHz$

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