A) \[733.3\,\,Hz\]
B) \[782.3\,\,Hz\]
C) \[833.3\,\,Hz\]
D) none of these
Correct Answer: A
Solution :
Here: Speed of siren\[{{v}_{s}}=30\,\,m/s\] Frequency of siren\[n=800\,\,Hz\] Now the frequency heard from siren is \[n=\left( \frac{v}{v+{{v}_{s}}} \right)n=\frac{330}{330+30}\times 800\] or \[n=\frac{330}{360}\times 800=733.3\,\,Hz\]You need to login to perform this action.
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