Question

A battery-operated bell is surrounded by a box with double walls. The bell is ringing but no sound at all is heard outside the box. What is in the gap?
2 points
Captionless Image
A a solid
B a liquid
C a gas


(inappropriate answers will be reported)
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Answer 1

Answer:

When a bell rings , sound is produced , but as the jar is evacuated so it has no medium for sound waves to travel , therefore no sound will be heard . Because sound waves are mechanical longitudinal waves and mechanical waves require a medium , having the properties of inertia and elasticity , and in vacuum these properties are absent hence sound doesn't travel in vacuum . Therefore given assertion and reason are correct .

Answer 2

Answer: The answer is actually not in the option listed. The correct answer should be 'VACUUM'

Explanation: Sound can travel in both a liquid and a solid medium . Sound cannot travel in a vacuum medium