Stationary Waves/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

Tags

NGSS.HS-PS4-1

The moving black dot is called:

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

Tags

NGSS.HS-PS4-1

The stationary dot is called:

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

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

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-5

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

NGSS.HS-PS4-5

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

NGSS.HS-PS4-5

A standing wave:

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

Tags

NGSS.HS-PS4-5

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.

Standing wave patterns produced in a medium are constrained to integer or half-integer multiples of resonant wavelengths. If a rope is fixed at both ends 1 m apart, which wavelength below could not possibly produce a standing wave?

• 2 m

• 1/3 m

• 1/4 m

• 3 m

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

• True

• False

Tags

NGSS.HS-PS4-1