Question

A person has a hearing rang from 20Hz to 20kHz .what are the typical wavelengths of sound waves in air corresponding to these two frequencies? Take the speed of sound in air as 344ms-1

Answer 1

from 17.2 to 17.2 ×10*3 m.

Answer 2

Given frequencies are 20 Hz and 20 kHz and Velocity = 344ms^-1

We know that velocity = wavelength * frequency. It can also be written as

                         wavelength = Velocity/Frequency.



(i) Consider frequency = 20Hz

     Wavelength = 344/20

                          = 17.2m.


(ii) Consider frequency = 20kHz.

  Wavelength = 344/20000

                        = 0.0172 m.


Hope this helps!