A sound of frequency travels from air into water

PHYSICS · Single correct · A Level · Physics · Waves · Waves

Problem

A sound of frequency

850\,\text{Hz}

travels from air into water. The speed of sound is

340\,\text{m\,s}^{-1}

in air and

1480\,\text{m\,s}^{-1}

in water. What is the ratio of its wavelength in water to that in air? (a)

0.23

(b)

4.35

(c)

1.00

(d)

2.50