Question

A wavelength $0.60cm$ is produced in air and it travels at a speed of $300ms$. lt will be an

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

Answer 1

Answer: (C)

Ultrasonic wave

(c) $n=\frac{v}{\lambda }=\frac{300}{0.6\times {10}^{-2}}Hz=\frac{3}{6}\times {10}^{4}Hz=50,000Hz$
$\Rightarrow$ Wave is ultrasonic.