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14. waves and sound — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics14. waves and sound1 Mark
MCQ
The minimum intensity of sound is zero at a point due to two sources of nearly equal frequencies, when
  • A
    Two sources are vibrating in opposite phase
  • B
    The amplitude of two sources are equal
  • ✓
    At the point of observation, the amplitudes of two $S.H.M.$ produced by two sources are equal and both the $S.H.M.$ are along the same straight line
  • D
    Both the sources are in the same phase
✓

Answer

Correct option: C.
At the point of observation, the amplitudes of two $S.H.M.$ produced by two sources are equal and both the $S.H.M.$ are along the same straight line
c
(c) If two waves of nearly equal frequency superpose,

they give beats if they both travel in straight line and ${I_{\min }} = 0$

if they have equal amplitudes.

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