Question

A wave pulse on a string has the dimension shown in figure. The wave speed is v = 1 cm/s. If point O is a free end. The shape of wave at time t = 3 s is –

• A.
• B.
• C.
• D.

Answer 1

Answer: (D)

Answer 2

In 3 sec, half the reflected cycle will superimpose on the remaining half cycle of incident wave, so amplitude of resulting wave becomes (1 + 1) = 2 cm