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AP® Physics 1 & 2

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Difficult

Reflected Pulses

APPH12-GVXZZE

Two wave pulses which both have amplitudes of 10 cm are sent down a string, toward an end that is free to slide up and down. The front pulse is reflected when it strikes the end and moves back toward the oncoming second pulse.

As the pulses are crossing, the resulting amplitude is __________ because of ______________ interference.

A

0 cm, constructive

B

0 cm, destructive

C

20 cm, constructive

D

20 cm, destructive