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

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

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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

Discussion

2.	In an experiment with sonometer a tuning fork of frequency 256Hz resonates with a length of 25cm and another tuning fork resonates with a length of 16x\cm. Tension of the spring remaining constant the frequency of the second tuning fork is?
A.	163.84Hz
B.	400Hz
C.	320Hz
D.	20.4Hz
Answer» C. 320Hz

Discussion

Explore topic-wise MCQs in Engineering Physics Questions and Answers.

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

In an experiment with sonometer a tuning fork of frequency 256Hz resonates with a length of 25cm and another tuning fork resonates with a length of 16x\cm. Tension of the spring remaining constant the frequency of the second tuning fork is?