Waves - NEET Physics Questions

Question 91: easy

Assertion (A): Wave velocity is equal to group velocity in a non-dispersive medium.

Reason (R): A non-dispersive medium is one in which the wave velocity is frequency dependent.

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

View Answer

In a non-dispersive medium, the phase velocity (wave velocity) \(v_p\) is constant, meaning it does not depend on frequency. In this case, group velocity \(v_g\) equals \(v_p\). So (A) is true. Reason (R) is false because a non-dispersive medium has wave velocity independent of frequency.

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