Beats and Independent Light Sources – Rankers Physics
Topic: Waves
Subtopic: Sound Wave and its Characteristics

Beats and Independent Light Sources

Assertion (A): Beats are not observed in case of light waves from two independent sources.
Reason (R): The phase difference between two light sources changes randomly.
 
(1) Both (A) & (R) are true and the (R) is the correct explanation of the (A)
(2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(3) (A) is true but (R) is false
(4) Both (A) and (R) are false

Solution:

Stable beats require coherent sources with a constant phase difference. Independent light sources have rapidly and randomly changing phase differences, making stable beats unobservable.

Thus, Assertion (A) is true, and Reason (R) is true and is the correct explanation of (A).

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