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    Physics
    Grade-8
    Easy

    Question

    Density variations are not caused among the particles of the medium when they vibrate ____ the direction of the wave propagation.

    1. In
    2. At 30-degree angle to
    3. At 90-degree angle to
    4. At 135-degree angle to

    Hint:

    Pressure and density variations are seen in a longitudinal wave, where the particles of the medium vibrate parallel to the direction of wave propagation.

    The correct answer is: At 90-degree angle to

      • Pressure and density changes do not occur in a transverse stationary wave.
      • In a transverse wave, particles of the medium vibrate and move in a direction perpendicular to the direction of wave propagation.
      • So, the correct option is c.

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