An underwater sonar source operating at a fre | vedclass

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(A) When a sound wave travels from one medium to another,its frequency remains unchanged because it is determined by the source.Therefore,the frequenc

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$5.5 \, mm, 60 \, kHz$

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(A) When a sound wave travels from one medium to another,its frequency remains unchanged because it is determined by the source.Therefore,the frequency of the wave in air remains $f = 60 \, kHz$.The wavelength $\lambda$ in air is given by the formula $\lambda = \frac{v}{f}$,where $v$ is the velocity of sound in air.Substituting the given values: $\lambda = \frac{330 \, m/s}{60 	imes 10^3 \, Hz} = \frac{330}{60000} \, m = 0.0055 \, m = 5.5 \, mm$.Thus,the wavelength is $5.5 \, mm$ and the frequency is $60 \, kHz$.

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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