Question

The figure shows at time $t=0\text{sec}$, a rectangular and triangular pulse on a uniform wire. They are approaching each other. The pulse speeds are $0.5\text{cm/s}$ each. The resultant pulse at $t=2\text{sec}$ is

• A.
• B.
• C.
• D.

Answer 1

The correct option is D

At $t=2\text{sec}$, the positions of both the pulses are separately shown in Fig. (a) and Fig. (b);


By the definition of Principle of superposition, displacements due to both the pulses from $x=0\text{to}x=1$ will get added up and the resultant shape of the pulse is shown in the Fig. (c).
Thus, option (d) is the correct answer.