A) 109 vib/sec
B) 132 vib/sec
C) 140 vib/sec
D) 248 vib/sec
Correct Answer: C
Solution :
Similar to previous question The frequency of reflected sound heard by the driver \[{n}'=n\,\left( \frac{v-(-{{v}_{0}})}{v-{{v}_{s}}} \right)=n\,\left( \frac{v+{{v}_{0}}}{v-{{v}_{s}}} \right)\] \[=124\,\left[ \frac{330+(72\times 5/18)}{330-(72\times 5/18)} \right]\]= 140 vibration/sec.You need to login to perform this action.
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