Question

a long spring is attached to a wall at one end. a pulse is sent down the spring. when the pulse reaches the wall it bounces back upside down. at the moment it reaches the wall, a second pulse is sent down the spring. what happens when the two pulse meet? a the pulses will reflect off each other. b the pulses generate destructive interference. c the pulses generate constructive interference. d the pulses cancel each other out and do not move.

Explanation:

When two pulses meet, if one is upright and the other is inverted (as in this case where one pulse bounces back upside - down), they experience destructive interference. Destructive interference occurs when the displacements of the pulses are in opposite directions and they partially or completely cancel each other out at the point of overlap.

Answer:

B. The pulses generate destructive interference.