An observer moves towards a stationary source of sound with a speed 
th of the speed of sound. The wavelength and frequency of the source emitted are 
and 
respective. The apparent frequency and wavelength recorded by the observer are respectively: -
Text Solution
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When an observer moves towards an stationary source of sound, then apparent frequency heard by the observer increases. The apparent frequency heard in this situation
as source is stationary hence, 
Given 
Substituting in the relation for 
, we have
Motion of observer does not affect the wavelength reaching the observer, hence, wavelength remains 
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