A) 8
B) 4
C) 6
D) 1
Correct Answer: B
Solution :
Observer is moving away from siren 1 and towards the siren 2. Hearing frequency of sound emitted by siren 1 \[{{n}_{1}}=n\left( \frac{v-{{v}_{0}}}{v} \right)=330\,\left( \frac{330-2}{330} \right)=328Hz\] Hearing frequency of sound emitted by siren 2 \[{{n}_{2}}=n\,\left( \frac{v+{{v}_{0}}}{v} \right)=330\,\left( \frac{330+2}{330} \right)=332Hz\] Hence, beat frequency \[={{n}_{2}}-{{n}_{1}}=332-328=4.\]You need to login to perform this action.
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