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Sound Waves

A source of s...

Question

A source of sound waves towards an observer.

A

the wavelength of sound in the medium towards the observer is decreased

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B

the frequency of the source is increased

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C

the velocity of the sound in the medium is increased

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D

the amplitude of vibration of the particles is increased

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Solution

The correct option is B the frequency of the source is increased
When source moves toward observer, the observed frequency increases and observed wavelength decreases.
$f = \frac{v_{s o u n d}}{v_{s o u n d} - v_{s o u r c e}} f_{s o u r c e}$

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