Question

A sound wave whose frequency is 5000 Hz travels in air and then hits the water surface. The ratio of its wavelengths in water and air is ……. 

(a) 4.30 

(b) 0.23 

(c) 5.30 

(d) 1.23

Answer 1

(a) 4.30

Frequency of sound, f = 5000 Hz

Velocity of sound in air, v_a = 343 ms^-1

Velocity of sound in water, v_w = 1480 ms^-1