A) 7.8 Hz
B) 7.7 Hz
C) 3.9 Hz
D) Zero
Correct Answer: A
Solution :
The observer will hear two sound, one directly from source and other from reflected image of sound Hence number of beats heard per second =\[\left( \frac{v}{v-{{v}_{S}}} \right)\,n-\left( \frac{v}{v+{{v}_{S}}} \right)\,n\] = \[\frac{2nv{{v}_{S}}}{{{v}^{2}}-v_{S}^{2}}=\frac{2\times 256\times 330\times 5}{335\times 325}\]= 7.8\[Hz\]You need to login to perform this action.
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