Assertion :A bell ringing in an evacuated jar cannot be heard. Reason: Sound waves needs a medium to travel.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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 .

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