As Physics Standing Waves

Standing waves are created by

• Two identical waves reflecting off each other

• Two identical waves being diffracted together

• Two identical waves (save f, same amplitude) move through each other in opposite directions

• Two identical waves are diffracted from two identical sources

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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

The stationary dot is called:

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

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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

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.

Tags

NGSS.HS-PS4-1

A receiver R is moved from S (a reflector) towards T (a transmitter). The intensity changes as in the diagram. Which of the following statements is correct?

• R is measuring the amplitude.
• The frequency of the microwaves is 2.5 GHz.
• The wavelength of the microwaves is 6.0 cm.
• The amplitudes of the transmitted and reflected waves are always equal.

Tags

NGSS.HS-PS4-1

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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NGSS.HS-PS4-1

What are the conditions for the 2 ends of 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.

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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NGSS.HS-PS4-1

A 40cm pipe, opened at both ends (see left image above) makes a note. The speed of sound in air is 330 m/s. Calculate the fundamental frequency

• 4.125 Hz

• 264 Hz

• 26400 Hz

• 412.5 Hz

Tags

NGSS.HS-PS4-1