The speed of sound in air is v. Both the source and observer are moving towards each other with equal speed u. The speed of wind isw from source to observer. Then, the ratio (ff0) of the apparent frequency to the actual frequency is given by
A
v+uv−u
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B
v+w+uv+w−u
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C
v+w+uv−w−u
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D
v−w+uv−w−u
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Solution
The correct option is Cv+w+uv−w−u f=(v+u+wv−u+w)f0⇒ff0=(v+u+wv−u+w)Hence,optionCiscorrectanswer.