Tuning Fork and Resonance – Rankers Physics

Sound Wave and its Characteristics: Practice Problem & Solution

Assertion (A): A vibrating tuning fork sounds louder, when its stem is pressed against a desk top. Reason (R): When a sound wave is incident on the surface of a desk, it is totally reflected.  
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(A) is true but (R) is false
Both (A) and (R) are false

Solution Explained:

To solve this problem, we apply the core principles of Sound Wave and its Characteristics. Understanding the underlying formula is key to arriving at the correct answer below:

Assertion (A) is true due to forced vibrations and resonance. The desk provides a larger surface area to vibrate, increasing the loudness.

Reason (R) is false because sound waves are not totally reflected; some energy is transmitted to the desk.

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