Question

A tuning fork produces 4 beats per second with both 49 cm and 50 cm of stretched wire of a sonometer. Frequency of the fork is………….Hz. 

(A) 396 

(B) 196 

(C) 296 

(D) 693

Answer 1

The correct option (A) 396   

Explanation:

(V/98) – (V/100) = 8 

∴ {2V/(9800) = 8 

∴ V = 9800 × 4cm/s = 392m/s 

∴ f₁ = 392Hz f₂ = 400Hz 

∴ using fork which produces 4 beats with these wire has frequency 396Hz