Question

Assertion : Where two vibrating tuning forks having frequencies `256 Hz` and `512 Hz` are held near each other, beats cannot be heard.
Reason : The princile of superposition is valid only if the frequencies of the oscillators are nearly equal.
A. If both assertion and reason are true and reason is the correct expleanation of assertion.
B. If both assertion and reason are true and reason is not the correct expleanation of assertion.
C. If assertion is true but reason is false.
D. If assertion and reason both are false.

Answer 1

Correct Answer - C
The principle of superposition does not state that the frequencies of the oscillation should be nearly equal for beats to be heard the condition is that difference in frequencies of the two oscillations should not be more than 10 times per seconds for a normal human ear to recognise it. Hence we cannot hear beats in the case of two tuning forks vibrating at frequencies 256 Hz and 512 Hz respectively.