NTA Abhyas JEE Main2020PhysicsWaves and SoundPractice
If a transverse pulse is created at the topmost point of a uniform rope suspended vertically, then
Options
- Aspeed of pulse remains constant.
- Bspeed of the pulse decreases with constant rate as pulse moves downward.
- Cspeed of the pulse decreases with increasing rate as pulse moves downward.
- Dspeed of the pulse increases with constant rate as pulse moves downward.
Correct answer
B. speed of the pulse decreases with constant rate as pulse moves downward.
Step-by-step solution
Tension at P = m L gx = μgx v = T μ = gx a = d v d t = d g x d t a = g 2 x d x d t = g 2 x v = g 2 Thus with decrease in x , speed of pulse will also decrease but at constant rate.