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Question

The speed of sound __________ as it passes from solid to gaseous medium.

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
decreases

Speed of Sound Changes: Solid to Gas Medium

The speed of sound depends fundamentally on the properties of the medium it travels through, specifically its elasticity and density.

Medium Properties and Sound Speed

  • Solids: Have tightly packed particles with strong intermolecular forces. This allows vibrations (sound waves) to be transmitted very rapidly. Solids typically exhibit high elasticity.
  • Gases: Have particles that are far apart with weak intermolecular forces. Sound wave transmission is slower because it takes longer for particles to collide and transfer energy. Gases generally have low elasticity compared to solids.

Transition from Solid to Gas

When sound propagates from a solid medium into a gaseous medium:

  • The particle spacing increases dramatically.
  • The intermolecular forces become much weaker.
  • The efficiency of energy transfer between particles reduces.

These factors lead to a significant reduction in the speed at which sound waves can travel. Therefore, the speed of sound decreases as it passes from solid to gaseous medium.

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