Two pulses are travelling in the same medium and are at positions, at a time as shown in figure

Subsequent possible interference pattern at different times are shown below.

Write the correct order of pattern from the time when two pulses meet each other.

Options

A. `II to I to III to IV`
B. `I to II to III to IV`
C. `II to III to IV to I`
D. None as shape of each pulse will be altered as pulses passed each other

Answer

A

Explanation

Interfering waves do not after the effect of each other.