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(C) The frequency $n$ of a wave is given by the formula $n = \frac{v}{\lambda }$,where $v$ is the speed and $\lambda$ is the wavelength.Given: $v = 30

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Ultrasonic wave

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(C) The frequency $n$ of a wave is given by the formula $n = \frac{v}{\lambda }$,where $v$ is the speed and $\lambda$ is the wavelength.Given: $v = 300 \ ms^{-1}$ and $\lambda = 0.60 \ cm = 0.60 	imes 10^{-2} \ m$.Substituting the values: $n = \frac{300}{0.60 	imes 10^{-2}} \ Hz$.$n = \frac{300}{0.006} \ Hz = 50,000 \ Hz$.Since the audible range for humans is $20 \ Hz$ to $20,000 \ Hz$,any frequency above $20,000 \ Hz$ is classified as an ultrasonic wave.Therefore,the wave is an ultrasonic wave.

$A$ wave with a wavelength of $0.60 \ cm$ is produced in air and it travels at a speed of $300 \ ms^{-1}$. This wave is classified as:

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