Question

The tension of a stretched string is increased by
69% In order to keep its frequency of vibration
constant. its length must be increased by
(a) 20%
(b) 30%
(c) 69%
(d) √69%​

Answer 1

HI DEAR SHRESTA HERE !!!!PLS FOLLOW ME FRNDS AND THANK MY ANSWER TOO....

Tension is increased by 69%

new tension is 169T

f∝  

T

​  

⇒  

f  

2

​  

 

f  

1

​  

 

​  

=  

10

13

​  

=  

l  

1

​  

 

l  

2

​  

 

​  

 

∴l is to be increased by 30%