Question

A transverse wave is travelling along a string from left to right. The figure below represents the shape of the string at a given instant. At this instant, the points have an upward velocity are (here X-wave displacement, Y-particle displacement)

• A. D,E,F
• B. A,B,H
• C. B,D,F
• D. A,E,H

Answer 1

The correct option is A D,E,F

The equation of wave is form. $y=A\sin (Kx-\omega t)$
as it is travelling from left to right
$\therefore v=\frac{dy}{dy}=-A\omega \cos (Kx-\omega t)$
$\therefore$ points of positive velocity are D, E and F.