Oscillations and Waves-Beats (NEET Physics): Questions 5 - 8 of 9

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Question number: 5

» Oscillations and Waves » Beats

MCQ▾

Question

A sound wave of frequency ν travels horizontally to the right. It is reflected from a large vertical plane surface moving to the left with a speed V. The speed of sound in the medium is c.

Choices

Choice (4) Response
a.

The number of beats hears by a stationary listener to the left of the reflecting surface is VνcV

b.

The frequency of the reflected wave is ν(c+V)cV

c.

The number of waves striking the surface per second is ν(c+V)c

d.

The wavelength of the reflected wave is ν(cV)c+V

Question number: 6

» Oscillations and Waves » Beats

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.

7.76 Hz

b.

3.9 Hz

c.

Zero

d.

7.06 Hz

Question number: 7

» Oscillations and Waves » Beats

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.

17

d.

20

Question number: 8

» 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 2 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.

6

c.

4

d.

1

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