Standing Waves Physics

A standing wave is formed on a string of length d. Which of the following statements is/are true?

1. A wave is travelling along the string and reflecting back on itself.

2.The standing wave is an example of superposition.

3.The wavelength of the standing wave is d.

• 1, 2 and 3

• Only 1 and 2

• Only 2 and 3

• Only 1

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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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The moving black dot is called:

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

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The stationary dot is called:

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

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Which harmonic is shown?

• 1st
• 2nd
• 3rd
• 4th

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Which harmonic is shown (the animation shows a standing wave in a pipe that is closed at one end)?

• 2nd

• 3rd

• 4th

• 5th

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A standing wave:

• transports energy but does not move.
• is composed of a single travelling wave.
• stores energy.
• makes a loud noise.

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What are the boundary conditions for these standing waves?

• Anti-nodes at each end.
• The surface of the string is smooth.
• The string is free at both ends.
• There is a node at each end.

A string that is 2.0 meters long is fixed at both ends and tightened until the wave speed is 18 m/s. What is the frequency of the standing wave shown in the figure?

• 27 Hz
• 54 Hz
• 81 Hz
• 110 Hz

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NGSS.HS-PS4-1

A standing wave is oscillating at 950 Hz on a string, as shown in the figure. What is the wave speed?

• 380 m/s
• 570 m/s
• 290 m/s
• 190 m/s

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