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A 300 H(Z) source, an observer and a win...

A `300 H_(Z)` source, an observer and a wind are moving as shows in the figure with respect to the ground. What frequency is heard by observer ? Take speed of sound in air = `340 m//s` .
`underset(20m//s)overset(observer)(larr)` `underset(rarr)(rarr)5 m//s` `underset(10m//s)overset(source)(rarr)`

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Verified by Experts

The correct Answer is:
B, D
`f' = f((nu - nu_(w) - nu_(o))/(nu - nu _(w) + nu_(S)))`
= `300 [(340 - 5 - 20)/(340 - 5 +10)]`
= `247 H_(Z)`
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