Question

A spring oscillating in water is acted upon by an external force Bcosωt . With the passage of time the frequency of the spring tends to be:

(a) greater than ω

(b) less than ω

(c) equal to ω

(d) decreasing exponentially

Answer 1

Correct option  (c) equal to ω 

Explanation:

When a spring oscillates in water under periodic force F = Bcosωt , the oscillation is like forced oscillation and so after some time the spring oscillate with frequency equal to that of the force.