Oscillations and Waves-Beats (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 1 - 4 of 9

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Question number: 1

» Oscillations and Waves » Beats

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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.

10

c.

4

d.

16

Question number: 2

» Oscillations and Waves » Beats

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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.

6

c.

8

d.

2

Question number: 3

» Oscillations and Waves » Beats

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Assertion-Reason▾

Question

Assertion (Ꭺ)

Beats cannot be produced by light sources.

Reason (Ꭱ)

Light sources have constant phase difference.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

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

c.

Both Ꭺ and Ꭱ are false

d.

Ꭺ is true but Ꭱ is false

Question number: 4

» Oscillations and Waves » Beats

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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.

Zero

c.

5.3 Hz

d.

4.9 Hz

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