Which of the following sound frequencies cannot be heard by a human ear?

(i) 10 Hz (ii) 100 Hz

(iii) 10,000 Hz (iv) 15 Hz

(v) 40,000 Hz

Choose the infrasonic waves and ultrasonic waves from the following frequencies:

(i) 10,000 Hz (ii) 30,000 Hz

(iii) 18 Hz (iv) 50,000 Hz

(v) 10 Hz

What is the frequency range of hearing in humans?

The echo of a sound is heard after 5 seconds. If the speed of sound in air be 343 m/s, calculate the distance of the reflecting surface.

The speed of sound in water is 1500 metres per second. How far away from an under-sea rock should a deep sea diver be so that he can hear his own echo?