Question

sound waves of wavelength lambda travelling in a medium waih a speed of vm/s enter into another medium where its speed 2vm/s. wavelength of the sound waves in the second medium is

Answer 1

Wavelength of sound waves in the first medium,

λ=

υ

ν

.......(i)

Wavelength of sound waves in the second medium,

λ

′

=

υ

′

2ν

........(ii)

As the frequency of the wave remains unchanged with the change in medium

∴υ=υ

′

.........(iii)

Divide (ii) by (i), we get

λ

λ

′

=2

or λ

′

=2λ