# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1889 - 1892 of 2320

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## Question number: 1889

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MCQ▾

### Question

An observer is moving away from source of sound of frequency 500 Hz. His speed is 33 m/s. If speed of sound is 330 m/s, then the observed frequency is

### Choices

Choice (4)Response

a.

140 Hz

b.

130 Hz

c.

121 Hz

d.

110 Hz

## Question number: 1890

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MCQ▾

### Question

A source of sound placed at the open end of a resonance column sends an acoustic wave of pressure amplitude P 0 of the tube. If the atmospheric pressure is P A, then the ratio of maximum and minimum pressure at the closed end of the tube will be,

### Choices

Choice (4)Response

a.

b.

c.

d.

All of the above

## Question number: 1891

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MCQ▾

### Question

A source of sound of frequency 256 Hz is moving rapidly towards a wall with a velocity of 5 m/s. The speed of sound is 330 m/s. If the observer is between the wall and the source, then the beats heard per second will be,

### Choices

Choice (4)Response

a.

Zero

b.

7.06 Hz

c.

3.9 Hz

d.

7.76 Hz

## Question number: 1892

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MCQ▾

### Question

Two whistles A and B produces notes of frequencies 500 Hz and 530 Hz respectively. There is a listener at the midpoint of the line joining them. Now the whistle A and the listener are started moving with speed 30 m/s away from the whistle B. If speed of sound be 330 m/s, how many beats will be heard by the listener?

### Choices

Choice (4)Response

a.

18

b.

19

c.

20

d.

17

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