Question

the.... of sound produced by a vibrating string decreases with the increase in length

Answer 1

Frequency of the tones of sound produced by a vibrating string decrease with increase in the length. Pitch is related to frequency. As frequency increase the pitch increases.

Frequency is proportional to v / (2L) ,
v = speed of sound . L = length of the string.

Answer 2

it's not correct........mmmm