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

Gujarat BoardEnglish MediumSTD 11 SciencePhysics14. waves and sound1 Mark
MCQ
The particles of a medium vibrate about their mean positions whenever a wave travels through that medium. The phase difference between the vibrations of two such particles
  • A
    Varies with time
  • ✓
    Varies with distance separating them
  • C
    Varies with time as well as distance
  • D
    Is always zero
✓

Answer

Correct option: B.
Varies with distance separating them
b
(b) The phase difference between the vibrations of two particles of the medium is given by$:$

$\Delta \phi=\frac{2 \pi}{\lambda} \Delta x$

it is clear that phase difference varies as the path difference between the particles varies, which is the distance, separating the particles.

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