A string of length 2L, obeying Hooke's Law, is stretched so that its extension is L. The speed of the tranverse wave travelling on the string is v. if the string is futher stretched so that the extension in the string becomes 4L. The speed of transverse wave travelling on the string will be

Options

A. `sqrt(2)`V
B. V
C. `2sqrt(2)V`
D. 2V

Answer

C

Explanation

`v=sqrt((T)/(mu))`
T can be calculated by using Hooke's law and on stretching `mu` also changes.