A source emits a sound of a frequency of 400Hz, but the listener hears it’s to be 390Hz. Then?

The listener has a defective ear

The listener is moving towards the source

The source is moving towards the listener

The listener is moving away from the source

The listener has a defective ear

A source emits a sound of a frequency of 400Hz, but the listener hear

1.	A source emits a sound of a frequency of 400Hz, but the listener hears it’s to be 390Hz. Then?
A.	The listener is moving towards the source
B.	The source is moving towards the listener
C.	The listener is moving away from the source
D.	The listener has a defective ear
Answer» D. The listener has a defective ear

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A source emits a sound of a frequency of 400Hz, but the listener hears it’s to be 390Hz. Then?

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