A sound source emits a frequency of while moving towards a rigid wall at a speed of

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Problem

A sound source emits a frequency of 180 Hz180\,\mathrm{Hz} while moving towards a rigid wall at a speed of 5 m s−15\,\mathrm{m\,s^{-1}}. An observer moves away from the wall at a speed of 5 m s−15\,\mathrm{m\,s^{-1}}. Both source and observer move along a straight line perpendicular to the wall. The number of beats per second heard by the observer is given that the speed of sound is 355 m s−1355\,\mathrm{m\,s^{-1}}. (1) 5 beats/s5\text{ beats/s} (2) 10 beats/s10\text{ beats/s} (3) 6 beats/s6\text{ beats/s} (4) 8 beats/s8\text{ beats/s}

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