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(D) The speed of sound $v$ is given by $v = f \lambda$,where $f$ is frequency and $\lambda$ is wavelength. Since the speed of sound in a medium is con

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Infrasonic waves

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(D) The speed of sound $v$ is given by $v = f \lambda$,where $f$ is frequency and $\lambda$ is wavelength. Since the speed of sound in a medium is constant,frequency and wavelength are inversely proportional $(f \propto 1/\lambda)$. Audible sound ranges from $20 \,Hz$ to $20,000 \,Hz$. Waves with a frequency lower than $20 \,Hz$ have a wavelength greater than that of audible sound. These are known as Infrasonic waves. Therefore,the correct option is $D$.

$A$. Temperature of gas is made $4$ times and pressure $2$ times	$P$. Speed becomes $2\sqrt{2}$ times
$B$. Only pressure is made $4$ times without change in temperature	$Q$. Speed becomes $2$ times
$C$. Only temperature is changed to $4$ times	$R$. Speed remains unchanged
$D$. Molecular mass of the gas is made $4$ times	$S$. Speed becomes half

Sound waves of wavelength greater than that of audible sound are called

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