NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1888 - 1891 of 2184

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Question number: 1888

» Oscillations and Waves » Beats

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MCQ▾

Question

A sound wave of frequency 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 wavelength of the reflected wave is

b.

The frequency of the reflected wave is

c.

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

d.

The number of waves striking the surface per second is

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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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.

All of the above

Question number: 1891

» Oscillations and Waves » Beats

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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.

Zero

b.

7.06 Hz

c.

3.9 Hz

d.

7.76 Hz