A Source Travelling to the Right at a Speed of 10

A source travelling to the right at a speed of 10 m/s emits a sound wave at a frequency of 100 Hz.The sound wave is reflected off a reflector which is travelling to the left at a speed of 5 m/s.What is the frequency of the reflected sound wave detected by a listener back at the source?

A) 105 Hz
B) 104 Hz
C) 109 Hz
D) 96 Hz
E) 91 Hz

Correct Answer:

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