Question

what is the sound of frequencies up to 120 khz. determine the wavelength of sound in air at this frequency take the speed of sound in air as 344 metre per second​

Answer 1

Answer:

2.87×10 −3m.

Explanation:

The relationship between the frequency, wavelength and speed of sound or velocity is given as follows.

Frequencyν=

wavelengthλ

wave velocityv

​

From the above equation, wavelength is derived as, Wavelengthλ=

Frequencyν

wavevelocity v

​

In the question, the velocity of sound is 344 m/s and frequency=120 kHz = 120×103

Hz is given.

Therefore,

Wavelengthλ=

ν

v

​

=

120×10

3hz

334m/s

​

=2.87×10

−3

m.

Hence, the wavelength of the sound wave is given as 2.87×10

−3m.