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Q85 (NDA-I/2024) Science & Technology › Basic Science (Physics, Chemistry, Biology) Official Key

Which one of the following does not apply to sound waves in fluids ?

Explanation

Sound waves in fluids (liquids and gases) are longitudinal waves, not transverse waves. In longitudinal waves, particles of the medium vibrate back and forth parallel to the direction of the wave's propagation, creating regions of compression and rarefaction. Fluids do not possess the shear strength (rigidity) required to support the propagation of transverse waves through their bulk.

  • Option A: Sound waves are mechanical waves that transport energy from one point to another.
  • Option B: They require a material medium (solid, liquid, or gas) to travel and cannot propagate through a vacuum.
  • Option D: Sound travels faster in liquids than in gases because liquids are significantly less compressible and have a higher bulk modulus, allowing vibrations to transmit more quickly.

Since sound waves in fluids are exclusively longitudinal, Option C is the statement that does not apply.

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