Standing waves - Basics

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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Do standing waves carry energy from one area to another?

• Yes

• No

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In the diagram which letters represent the nodes

• A B C

• A C 3

• B D

• B D E

• A C D

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NGSS.HS-PS4-1

Which statement is correct about the half wave A B C

• All particles in this half wave are in phase with each other as they all move in the same direction

• The particles A B C are in phase with the next half wave C D E because they all move in the same direction

• All particles in this part of the wave are out of phase with each other as they all move in different directions

• All particles in A B C have carried energy from one area to another

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NGSS.HS-PS4-1

Standing waves created in strings, pipes and closed pipes have specific wavelengths that fit into the length of those instruments

• True

• False

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Even numbered harmonics do not form in a closed pipe because

• the pipe “fits” only an odd number of quarter wavelengths

• the pipe “fits” only an even number of quarter wavelengths

• the pipe cannot put an anti-node at the open end

• the pipe cannot get enough air to vibrate in the pipe at these lengths

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NGSS.HS-PS4-1

What number harmonic is shown in C

• 1

• 2

• 3

• 4

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What number harmonic is shown in A

• 1

• 2

• 3

• 4

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What number harmonic is shown in D

• 1

• 2

• 3

• 4

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What number harmonic is shown in B

• 1

• 2

• 3

• 4

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