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Molecular Speeds - Vrms, Vavg, Vmps

A source of s...

Question

A source of sound and a detector are placed at the same place on ground. At t = 0, the source S is projected towards reflector with velocity $V_{0}$ in vertically upward direction and reflector starts moving down with constant velocity $V_{0}$ . At t = 0, the vertical separation the reflector and source is $H (> \frac{v_{0}^{2}}{2 g})$ . The speed of sound in air is v(>> $v_{0}$ ). Take f₀ as the frequency of sound waves emitted by source. Based on above information answer the following questions.

A

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B

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C

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D

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Solution

The correct option is A

Actual frequency emitted by source doesn't upon the velocity of source but frequency heard due to relative motion between the observer and the source.

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Similar questions

Q. A source of sound and detector are placed at the same place on ground. At t = 0, the source S is projected towards reflector with velocity

V_{0}

in vertically upward direction and reflector starts moving down with constant velocity

v_{0}

. At t = 0, the vertical separation between the reflector and source is

H (> \frac{v_{0}^{2})}{2 g})

. The speed of sound in air is

v (≫ v_{0})

. Take f_0 as frequency of sound waves emitted by source. Based on above information answer the following questions.

Wavelength of sound waves as received by detector before reflection at

t = \frac{V_{0}}{2 g}

Q. A source of sound and a detector are placed at the same place on ground. At

t = 0

S

is projected towards reflector with velocity

v_{0}

in vertical upward direction and reflector starts moving down with constant velocity

v_{0}

t = 0

, the vertical separation between the reflector and source is

H (> \frac{v_{0}^{2}}{2 g})

. The speed of sound in air is

v (>> v_{0})

f_{0}

as the frequency of sound waves emitted by source. Find the frequency of sound received by detector after being reflected by reflector at

t = \frac{v_{0}}{2 g}

Q. A source of sound emits sound waves at frequency

f_{0}

. It is moving towards an observer with fixed speed

v_{s}

v_{s} < v

, where v is the speed of sound in air). If the observer were to move towards the source with speed

v_{0}

, one of the following two graphs (A and B) will give the correct variation of the frequency f heard by the observer as

v_{0}

The variation of f with

v_{0}

is given correctly by:

Q. A source of sound emits sound waves at frequency

f_{0}

. It is moving towards an observer with fixed speed

v_{s} (v_{s} < v

, where v is the speed of sound in air). If the observer were to move towards the source with speed

v_{0}

, one of the following two graphs (A and B) will give the correct variation of the frequency f heard by the observer as

v_{0}

is changed.
The variation of f with

v_{0}

is given correctly by :

Q. The observer is moving with velocity

^{'} v_{0}^{'}

towards the stationary source of sound and then after crossing moves away from the source with velocity

^{'} v_{0}^{'}

. Assume that the medium through which the sound waves travel is at rest. If

^{'} v^{'}

is the velocity of sound and

^{'} n^{'}

is thee frequency emitted by the source then the difference between apparent frequencies heard by the observer is

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