Question

Two students are at two ends of a room. One of the students claps softly but the other

student is unable to hear the sound. The student takes a long metal rod and asks his friend to put

the ear on the rod at the other end. The student taps the metal rod with the same intensity

and the sound is heard by his friend. What can be concluded by this observation?

(a) Particles in air are closer to one another to the sound travels faster.

(b) Particles in air are farther from one another to the sound travels faster.

(c) Particles in a solid substance are closer to one another to the sound travels faster.

(d) Particles in a solid substance are farther from one another to the sound travels faster.​

Answer 1

Particles in a solid substance are closer to each other hence it's convenient for the sound waves to travel faster and to a longer distance.

Answer 2

Answer:

The correct option is (c) Particles in a solid substance are closer to one another so the sound travels faster.

Explanation:

• Sound waves are mechanical waves that need some kind of medium to travel.
• Sound waves cannot travel in a vacuum as there is no medium for propagation.
• Sound waves travel fastest in solids, followed by liquids. They are the slowest in gases.
• Solids have particles tightly packed, permitting the waves to travel fast.

Conclusion:

The metal rod has particles close to one another and so the sound travels fast.