Question

If vibrations of a string are to be increased by a factor 2, tension in the string must be made ____________

(a) Half

(b) Twice

(c) Four times

(d) Eight times

I had been asked this question in an international level competition.

This interesting question is from Acoustics in portion Waves of Engineering Physics I

Answer 1

Right option is (c) Four times

The best explanation: γ=1/2π×√(T/m)

To double γ, the tension must be made 4 times the original tension.