A) 620 Hz
B) 680 Hz
C) 720 Hz
D) 840 Hz
Correct Answer: B
Solution :
Effective value of velocity of source, \[{{v}_{s}}=\frac{100}{3}\cos \theta\] \[=\frac{100}{3}\times \frac{3}{5}=20\,m{{s}^{-1}}\] \[v'=\frac{v}{v-{{v}_{s}}}v\] \[v'=\frac{340}{340-20}\times 640\,Hz=680\,Hz\]You need to login to perform this action.
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