A) \[n=n\left( \frac{\upsilon +{{\upsilon }_{0}}}{\upsilon } \right)\]
B) \[n=n\left( \frac{\upsilon -{{\upsilon }_{0}}}{\upsilon +{{\upsilon }_{s}}} \right)\]
C) \[n=n\left( \frac{\upsilon +{{\upsilon }_{0}}}{\upsilon } \right)\]
D) none of these
Correct Answer: A
Solution :
The apparent frequency heard by traveler moving towards stationary train \[n=n\left( \frac{\upsilon +{{\upsilon }_{0}}}{\upsilon +{{\upsilon }_{s}}} \right)\] \[=n\left( \frac{\upsilon +{{\upsilon }_{0}}}{\upsilon } \right)\] \[(\therefore {{\upsilon }_{s}}=0)\] where \[\upsilon =\]speed of sound, \[{{\upsilon }_{0}}=\]speed of traveler
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