Question

Assertion (A): The sound of vibrations produced by a vibrating pendulum cannot be heard by us.

Reason (R): The frequency of a vibrating pendulum is very small and does not lie in the audible range.

Options

• If both Assertion and Reason are true and the Reason is correct explanation of the Assertion.

• If both Assertion and Reason are true, but Reason is not correct explanation of the Assertion.

• If Assertion is true, but the Reason is false.

• If Assertion is false, but the Reason is true.

Answer 1

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

Explanation:

Assertion (A) is true. The sound produced by a vibrating pendulum is generally not audible to the human ear.

Reason (R) is true. A pendulum vibrates with a very low frequency, usually below the audible range of about \(20\ \text{Hz}\) to \(20{,}000\ \text{Hz}\).

Therefore, both A and R are true, and R correctly explains A.