# Oscillations and Waves-Beats (NEET Physics): Questions 1 - 4 of 9

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## Question number: 1

» Oscillations and Waves » Beats

MCQ▾

### Question

Two sirens situated one kilometer apart are producing sound of frequency 330 Hz. An observer starts moving from one siren to the other with a speed of 5 m/s. If the speed of sound be 330 m/s, what will be the beat frequency heard by the observed

### Choices

Choice (4) Response

a.

8

b.

4

c.

16

d.

10

## Question number: 2

» Oscillations and Waves » Beats

MCQ▾

### Question

Two whistles A and B produce notes of frequencies 660 Hz and 596 Hz respectively. There is a listener at the midpoint of the line joining them. Now the whistle B and the listener start moving with speed 30 m/s away from the whistle A. If speed of sound be 330 m/s, how many beats will be heard by the listener?

### Choices

Choice (4) Response

a.

4

b.

2

c.

8

d.

6

## Question number: 3

» Oscillations and Waves » Beats

Assertion-Reason▾

### Assertion (Ꭺ)

Beats cannot be produced by light sources.

### Reason (Ꭱ)

Light sources have constant phase difference.

### Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Ꭺ is false but Ꭱ is true

c.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

d.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

## Question number: 4

» Oscillations and Waves » Beats

MCQ▾

### Question

A source of sound of frequency 233 Hz is moving rapidly towards a wall with a velocity of 3.5 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.

4.2 Hz

b.

5.3 Hz

c.

4.9 Hz

d.

Zero

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