A) \[20m/s\]
B) \[10m/s\]
C) \[5m/s\]
D) \[3.1m/s\]
Correct Answer: D
Solution :
Number of beats \[\Delta n={{n}_{1}}-{{n}_{2}}\] For number beat \[\therefore \] \[{{n}_{1}}-{{n}_{2}}=0\] \[\left( \frac{\upsilon +{{\upsilon }_{0}}}{\upsilon } \right)\times 324-\left( \frac{\upsilon -{{\upsilon }_{0}}}{\upsilon } \right)\times 320=0\] where, \[{{\upsilon }_{0}}\] = speed of observer, \[\upsilon =344\,m/s\] On solving \[{{\upsilon }_{0}}=3.1m/s\]
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