Question

A wavelength 0.60 cm is produced in air and it travels at a speed of 300 $m{s}^{-1}$. It will be an –

• A. Audible wave
• B. Infrasonic wave
• C. Ultrasonic wave
• D. None of the above

Answer 1

The correct option is C Ultrasonic wave

$n=\frac{v}{\lambda }=\frac{300}{0.6\times {10}^{-2}}Hz=\frac{3}{6}\times {10}^{5}Hz=50,000$ Hz
$\Rightarrow$ Wave is ultrasonic.