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Physics -- Sound
21.
Two sources of sound of the same frequency produce sound intensities I and 4I at a point P when used individually. If they
are used together such that the sounds from them reach P with a phase difference of 2π/3, the intensity at P will be
- A.2I
- B.3I
- C.4I
- D.5I
- Answer
- Report
Answer : [B]
22.
If two waves of the form y = asin(ωt - kx) and y = acos(kx - ωt) are superposed, the resultant wave will have amplitude
- A.0
- B.a
- C.√2a
- D.2a
- Answer
- Report
Answer : [C]
23.
A racing car moving towards a cliff sounds its horn. The driver observes that the sound reflected from the cliff has a pitch one octave higher than the actual sound of the horn. If V = the velocity of sound, the velocity of the car is
- A.V/√2
- B.V/2
- C.V/3
- D.V/4
- Answer
- Report
Answer : [C]
24.
The displacement of a particle in a medium due to a wave travelling in the x-direction through the medium is given by
y= Asin(αt - βx), where t = time, and α and β are constants. (Choose Multiple Answers)
- A.The frequency of the wave is α.
- B.The frequency of the wave is α/(2π).
- C.The wavelength is (2π)/β
- D.The velocity of the wave is α/β.
- Answer
- Report
Answer : [B, C, D]
25.
For a sine wave passing through a medium, let y be the displacement of a particle, v be its velocity and a be its
acceleration. (Choose Multiple Answers)
- A.y, v and a are always in the same phase.
- B.y and a are always in opposite phase.
- C.Phase difference between y and v is π/2.
- D.Phase difference between y and a is π/2.
- Answer
- Report
Answer : [B, C, D]
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