Which of the following sound frequencies is classified as ultrasound?

PHYSICS · Single correct · CBSE · Physics · Sound · Sound

Problem

Which of the following sound frequencies is classified as ultrasound? (a)

15\,\text{kHz}

(b)

10\,\text{Hz}

(c)

25\,\text{kHz}

(d)

18\,\text{kHz}