Case Study Based Questions and Answers: Sound Through Different Media

Case Study: Sound Through Different Media

Sound is a physical, longitudinal, mechanical wave produced by vibrations traveling through a medium (solid, liquid, or gas).

Case study based questions and answ

Three observers hear the sound of an explosion from the same distance but through different media. Observer A hears the sound through air, Observer B through water, Observer C through steel.

🌬️ Observer A
Sound through air

💧 Observer B
Sound through water

🔩 Observer C
Sound through steel

Progress: 0 of 5 answers opened

Question (a)

(a) Arrange the observers in the order in which they would hear the sound first.

Order: C → B → A

C: Steel → B: Water → A: Air

Reason:
Speed of sound is:

• Maximum in solids
• Less in liquids
• Least in gases

Question (b)

(b) In which medium will the sound travel the fastest and why?

Fastest in steel (solid).

Reason:
Particles are closely packed and elasticity is high, so vibrations transfer quickly.

Question (c)

(c) On a cold morning, sound from a distant train is heard more clearly than during noon. Give reason.

Air in morning has more humidity.
Humid air is less dense → sound travels faster.
Hence, sound is heard more clearly.

Question (d)

(d) "Solids are heavier, therefore sound should travel slower in them." Analyse this statement.

Statement is incorrect.

Speed of sound depends on:
V = √(Elasticity / Density)

Although solids are dense, they have very high elasticity.
So sound travels faster in solids.

Question (e)

(e) If sound could travel in vacuum, what property of sound would have to change?

Sound would have to change from a mechanical wave to a wave that does not need a medium.

Reason:
Sound requires particles to vibrate.
In vacuum, there are no particles.
So its nature must change.

Quick Revision Point

Sound travels fastest in solids, slower in liquids, and slowest in gases because particle arrangement and elasticity affect how quickly vibrations are transferred.