A whistle of frequency is sounded first in air (speed ) and then underwater (speed )

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

Problem

A whistle of frequency

500\,\text{Hz}

is sounded first in air (speed

340\,\text{m/s}

) and then underwater (speed

1500\,\text{m/s}

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

1.0

(b)

4.4

(c)

0.23

(d)

2.2