A) 270 Hz
B) 540 Hz
C) 135 Hz
D) 370 Hz
Correct Answer: A
Solution :
Here: Speed of the source \[{{V}_{s}}=20m/s\] Frequency of sound \[v=240\text{ }Hz\] Speed of the sound\[v=340\text{ }m/s\] The apparent frequency heard by observer is given by \[n=\left( \frac{\upsilon +{{\upsilon }_{0}}}{\upsilon -{{\upsilon }_{s}}} \right)n\] Or \[n=\frac{340+20}{340-20}\times 240\] Or \[n=\frac{360\times 240}{320}=270\,Hz\]You need to login to perform this action.
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