If the actual frequency of source is \( f \) and actual wavelength is \( \lambda \) and velocity...

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If the actual frequency of source is \( f \) and actual wavelength is \( \lambda \) and velocity of sound in given
\( P \) medium is \( v \) then we can calculate \( f_{a p p} \) for stationary observer by :-
W
(1) \( f_{\text {app }}=\frac{v_{\text {app }}}{\lambda_{\text {app }}} \)
(2) \( f_{a p p}=\frac{v}{\lambda_{a p p}} \)
(3) \( f_{a p p}=\frac{v_{\text {app }}}{\lambda} \)
(4) \( f_{a p p}=f \)
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