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Question

Source and observer start moving simultaneously along x and y-axis, respectively. The speed of source is twice the speed of observer, V0. If the ratio of observed frequency to the frequency of the source is 0.75, find the velocity of sound.

A
115V0
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B
175V0
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C
165V0
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D
195V0
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Solution

The correct option is C 165V0
OS=2OPcosα=25,cosβ=15f=f[VV0cosβV+V0cosβ]=fVV05V+(2V0)×(25)=fVV05V+4V05

Given ff=34=VxV+4x 132=5xV+4xV=16x=165V0

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