A) 600 Hz
B) 585 Hz
C) 645 Hz
D) 666 Hz
Correct Answer: D
Solution :
The perceived frequency \[(f)\] is related to the actual frequency \[({{f}_{0}})\] and the relative speeds of the source \[({{v}_{s}}).\]and observer \[({{v}_{o}})\] and the speed \[(v)\] of waves in the medium is given by \[f={{f}_{o}}\left( \frac{v+{{v}_{o}}}{v-{{v}_{s}}} \right)\] Give\[v=340\,m/s,\,{{v}_{o}}=15\,m/s,\,{{v}_{s}}=20\,m/s\] \[\therefore \] \[f=600\times \left( \frac{340+15}{340-20} \right)\] \[=\frac{355}{320}\times 600=666\,Hz\]You need to login to perform this action.
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