Question

Assertion : When two vibrating tuning forks having frequencies 256 Hz and 512 Hz are held near each other. beats cannot be heared.

Reason :The principle of superposition is valid only if the frequencies of the oscillators are nearly equal.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not correct explanation of A

(c) A is true but R is false

(d) A and R are false

Answer 1

The correct option is (c) A is true but R is false.

Explanation:

The principle of superposition docs not state that the frequencies oscillation should be nearly equal. And for beats to be heard the condition is that the difference in frequencies of the two oscillations be not more than 16 times per sec for a normal human ear to recognise it. Hence we canmot hear beats in the case of two tuning forks vibrating at frequencies 256 Hz and 512 Hz respectively.