Q 11-14-066JEE MainJEE Main 2023 (8 Apr, Shift 2)Easy
A guitar string of length $90$ cm vibrates with a fundamental frequency of $120$ Hz. The length of the string producing a fundamental of $180$ Hz will be ______ cm.
Numerical value type. Enter your answer.
Answer: 60
$f\propto\dfrac1L$: $L=90\times\dfrac{120}{180}=60$ cm.
Solution by Sreeraj P, M.Sc Physics