Wave Interference and Standing Waves

Standing waves are created by

• Two identical waves reflecting off each other

• Two identical waves being diffracted together

• Two identical waves move through each other in opposite directions

• Two identical waves are diffracted from two identical sources

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NGSS.HS-PS4-1

Two wave pulses one with a positive amplitude the other with equal negative amplitude travel on a cord approaching each other. What is the result of the oscillations when the pulses reach the same point?

• It is constructive interference with twice the amplitude

• It is destructive interference with zero amplitude

• It is constructive interference with slightly greater amplitude

• It is constructive interference with the negative amplitude

• The standing wave is produced

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NGSS.HS-PS4-5

Two wave pulses with equal positive amplitudes travel on a cord approaching each other. What is the result of the oscillations when the pulses reach the same point?

• It is constructive interference with twice the amplitude

• It is destructive interference with zero amplitude

• It is constructive interference with slightly greater amplitude

• It is constructive interference with the negative amplitude

• The standing wave is produced

Tags

NGSS.HS-PS4-1

In the diagram which letters represent the nodes

• A B C

• A C E

• B D

• B D E

• A C D

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NGSS.HS-PS4-1

Which harmonic is shown?

• 1st
• 2nd
• 3rd
• 4th

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NGSS.HS-PS4-1

This is an example of which type of wave behavior?

• Reflection
• Diffraction
• Constructive Interference
• Destructive Interference

What type of interference is represented in this diagram?

• Constructive

• Destructive

The figure shows several modes of vibration of a string fixed at both ends. The mode of vibration that represents the fifth harmonic is

• 1

• 2

• 3

• 4

• None of these is correct.

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NGSS.HS-PS4-1

The stationary dot is called:

• a node.
• an anti-node.
• the amplitude.
• the not moving bit.

The TOTAL string length pictured is 2 meters in length.  What is the SIZE of a wavelength?

• 1 meter

• 0.5 meters

• 4 meters

• 8 meters

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NGSS.HS-PS4-1