A) 270 Hz
B) 240 Hz
C) 268 Hz
D) 360 Hz
Correct Answer: A
Solution :
When source and observer move towards each other, the apparent frequency, \[n\frac{\upsilon +{{\upsilon }_{0}}}{\upsilon -{{\upsilon }_{s}}}n\] Here \[{{\upsilon }_{0}}={{\upsilon }_{s}}=20\,\,m/s\] \[\upsilon =240\,Hz\] \[\therefore \] \[n=\frac{340+20}{340-20}\times 240Hz\] \[=\frac{260}{320}\times 240Hz\] \[=270\,Hz.\]You need to login to perform this action.
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