A) 300 cycle/s
B) 320 cycle/s
C) 340 cycle/s
D) 330 cycle/s
Correct Answer: A
Solution :
From the relation, \[f={{f}_{0}}\left[ \frac{v+{{v}_{o}}}{v-{{v}_{s}}} \right]\] where \[v\] is the velocity of sound in air or vacuum. \[\Rightarrow \] \[400={{f}_{0}}\left[ \frac{340+50}{340-50} \right]\] \[\Rightarrow \] \[{{f}_{0}}=\frac{400\times 290}{390}\] \[{{f}_{0}}=\frac{400\times 290}{390}\] \[=300\,\,cycles/s\]
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