A) 286.5 Hz
B) 481 Hz
C) 434.2 Hz
D) 580 Hz
Correct Answer: C
Solution :
Here : Frequency of siren = 500 Hz The speed of siren \[{{\upsilon }_{s}}=50\,m\text{/}s\] Using Dopplers principle \[n=\frac{\upsilon }{\upsilon +{{\upsilon }_{s}}}n\] or \[n=\left( \frac{330}{330+50} \right)\times 500\] or \[n=\frac{330\times 500}{380}=434.2\,Hz\]You need to login to perform this action.
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