NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1887 - 1890 of 2142
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Question number: 1887
» Oscillations and Waves » Beats
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 | |
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| a. | The number of beats hears by a stationary listener to the left of the reflecting surface is |
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| b. | The frequency of the reflected wave is |
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| c. | The number of waves striking the surface per second is |
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| d. | The wavelength of the reflected wave is |
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Question number: 1888
» Oscillations and Waves » Doppler Effect in Sound
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 |
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| b. | 121 Hz |
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| c. | 130 Hz |
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| d. | 110 Hz |
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Question number: 1889
» Oscillations and Waves » Standing Waves in Strings and Organ Pipes
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 | |
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| a. |
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| b. |
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| c. |
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| d. | Question does not provide sufficient data or is vague |
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Question number: 1890
» Oscillations and Waves » Beats
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 |
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| b. | 3.9 Hz |
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| c. | Zero |
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| d. | 7.06 Hz |
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