A moving source emits a sound wave that is heard

A moving source emits a sound wave that is heard by a moving observer. Imagine a thin wall at rest between the source and observer. The wall completely absorbs the sound and instantaneously emits an identical sound wave. Use this scenario to explain why we can combine the Doppler shifts due to motion of the source and observer as in Eq. (12-14). [What is the net effect of this imaginary wall?]

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