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

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

NGSS.HS-PS4-5

A violin string of length 0.54 m and wave speed of 565 m/s along it. Calculate the frequency of the 5th harmonic.

• 1046.3 HZ

• 282.5 Hz

• 3138.89 Hz

• 1546 Hz

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NGSS.HS-PS4-1

The moving black dot is called:

• a node
• an anti-node
• an anti-amplitude
• the wangy bit

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NGSS.HS-PS4-1

Which harmonic is shown?

• 1st
• 2nd
• 3rd
• 4th

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NGSS.HS-PS4-1

NGSS.HS-PS4-5

The second harmonic on a string fixed at both ends shows

• A wavelength

• Half a wavelength

• Two wavelengths

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NGSS.HS-PS4-1

When a guitar is tuned to adjust its pitch, what is it that is changed?

• The wavelength of the fundamental.
• The frequency of the fundamental.
• The amplitude of the fundamental.

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NGSS.HS-PS4-1

The diagram shows the standing wave pattern of a vibrating string which is fixed at ends X and Y.
Which one of these statements is true?

• P to R is one wavelength.
• At R the string will move up.
• The lowest frequency for this string is one third of its current value.
• The kinetic energy of the string is at its maximum value.

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NGSS.HS-PS4-1

NGSS.HS-PS4-5

Which harmonic is shown?

• 2nd
• 3rd
• 4th
• 5th

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-5

The string is 3.5m long.  Measure the time period and hence calculate the speed of the underlying travelling waves.

• 0.7ms^-1
• 1.4ms^-1
• 2.8ms^-1
• 3.5ms^-1

Tags

NGSS.HS-PS4-1