# Oscillations and Waves (NEET (NTA-National Eligibility cum Medical Entrance Test) Physics): Questions 175 - 178 of 195

To view these problems with solutions proceed here and click "Subscribe Now".

## Question number: 175

» Oscillations and Waves » Doppler Effect in Sound

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.

121 Hz

c.

130 Hz

d.

110 Hz

To view these problems with solutions proceed here and click "Subscribe Now".

## Question number: 176

» Oscillations and Waves » Standing Waves in Strings and Organ Pipes

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.

Question does not provide sufficient data or is vague

To view these problems with solutions proceed here and click "Subscribe Now".

## Question number: 177

» 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

To view these problems with solutions proceed here and click "Subscribe Now".

## Question number: 178

» 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

To view these problems with solutions proceed here and click "Subscribe Now".