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

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Question number: 1889

» Oscillations and Waves » Doppler Effect in Sound

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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

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

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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

» Oscillations and Waves » Beats

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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

» Oscillations and Waves » Beats

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MCQ▾

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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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