The extension in a string obeying Hooke’* law is x. The speed of transverse waves in the stretched string is v. If the extension in the string is increased to 1.5x, the speed of transverse waves in it will be
(a) 1.22v
(b) 0.61v
(c) 1.5v
(d) 0.75v
Correct Answer is: (a) 1.22v
Tension ∝ extension, and speed ∝ √tension.
