A source emits a sound of a frequency of 400Hz, but the listener hears it‚Äö√Ñ√∂‚àö√ë‚àö¬•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

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

1.	A source emits a sound of a frequency of 400Hz, but the listener hears it‚Äö√Ñ√∂‚àö√ë‚àö¬•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‚Äö√Ñ√∂‚àö√ë‚àö¬•s to be 390Hz. Then$#

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