If an addition of 75 kg wt to the vibrating string rises the pitch is an octave of the original pitch, then the tension in the string is

Options

A. 50 kg wt
B. 100 gk wt
C. 75 kg wt
D. 25 kg wt

Answer

D

Explanation

`n_2/n_1 therefore (2n)/(n) = sqrt((T_1 +75)/(T_1))`
`therefore 3T_1 = 75 therefore T_1 = 25` kg wt