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A sound source A with a speed of 29.9 m/s and a reflecting surface B with...

A sound source A with a speed of 29.9 m/s and a reflecting surface B with a speed of 65.8 m/s moves directly towards each other. The source emits a wave frequency of 1.20 x 103 Hz, take the speed of sound in air to be 329 m/s. What is (a) the frequency as perceived by the reflector as the two sources moves towards each other; (b) The frequency as perceived by source A, when the sound wave reflected back to the source?

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