If you start with two sinusoidal waves of the same amplitude traveling in phase on a string and...

Question:

If you start with two sinusoidal waves of the same amplitude traveling in phase on a string and then somehow phaseshift one of them by 5.4 wavelengths, what type of interference will occur on the string?

(a) Intermediate (closer to fully constructive)

(b) Intermediate (closer to fully destructive)

(c) Fully destructive

(d) Fully constructive

Constructive and Destructive Interferences:

Interference occurs when two coherent waves overlap. When two identical waves are in phase -- that is, crest-to-crest and trough-to trough -- their resultant shows constructive interference with double the amplitude of the original wave. On the other hand, when the incoming waves are out of phase -- that is, crest-to-trough or trough-to-crest-- the resultant shows destructive interference.

Answer and Explanation: 1

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For constructive interference between the two sinusoidal waves, they should be multiples of one wavelength.

For destructive interference between...

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Constructive and Destructive Interference

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Chapter 5 / Lesson 16
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Interference occurs when two waves meet. Explore the lesson and examples to learn about the differences between constructive and destructive interference.


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