Question

A sound wave of wavelength 90 cm in glass is refracted into air. If the velocity of sound in glass is 5400 m/sec, the wavelength of the wave in air is -

• A. 55 cm
• B. 5.5 cm
• C. 55 m
• D. 5.5 m

Answer 1

Answer: (B)

5.5 cm

Answer 2

Frequency of wave will not change

v = nl

n ® const.

v µ l

$\frac { \mathrm { v } _ { \text {air } } } { \mathrm { v } _ { \text {glass } } }$ = $\frac { \lambda _ { \text {air } } } { \lambda _ { \text {glass } } }$ = =