Q

Assertion: At constant wave velocity, halving the wavelength doubles the frequency. Reason: Velocity = frequency × wavelength. Choose the correct answer.

RRB NTPC (Stage-I) 26/04/2016 (Shift-II) 2016
✓ Answer: A Both are true, and the reason correctly explains the assertion
Since f = v/λ, halving λ at fixed v doubles f. The reason therefore explains the assertion.