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  • Sound waves of wavelength λ travelling in a medium with a speed of v m/s enter into another medium where its speed is 2v m/s.

Sound waves of wavelength \lambda travelling in a medium with a speed of v m/s enter into another medium where its speed is 2v m/s. The wavelength of sound waves in the second medium is
(a) \lambda
(b)\frac{ \lambda}{2}
(c) 2\lambda
(d) 4\lambda

Answers (1)

The answer is the option (c)

v= u \lambda , u= \frac{v}{\lambda} 

When a wave passes from one medium to another, its frequency does not change but its velocity and wavelength changes.

\frac{v}{\lambda} = \frac{2v}{\lambda _{2}} 

Thus, \lambda _{2}=2 \lambda

Posted by

infoexpert24

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