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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, which of the following describe the resulting amplitude and the type of interference?

A

The resulting amplitude is $0\text{ cm}$ because of constructive interference.

B

The resulting amplitude is $0\text{ cm}$ because of destructive interference.

C

The resulting amplitude is $20\text{ cm}$ because of constructive interference.

D

The resulting amplitude is $20\text{ cm}$ because of destructive interference.

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