C.4 - 2 - Harmonics of a standing wave

What are harmonics of standing waves?

• Patterns that form at certain frequencies and wavelengths in a material with a standing wave

• Waves that travel in one direction only

• Random vibrations in a material

• Patterns that only occur in air

What is an important characteristic of wave velocity in a given medium?

• It varies with the frequency of the wave

• It is the same for all waves in that medium

• It depends on the amplitude of the wave

• It changes with the wavelength of the wave

According to the video, if the velocity of a wave in a material remains constant, what happens if the frequency of the wave increases?

• The wavelength increases

• The wavelength decreases

• The velocity increases

• The velocity decreases

For a material fixed at both ends, what must be present at the ends for a standing wave to occur?

• Antinodes

• Crests

• Troughs

• Nodes

How many nodes and antinodes are present in the first harmonic of a standing wave in a material fixed at both ends?

• One node, one antinode

• Two nodes, one antinode

• One node, two antinodes

• Two nodes, two antinodes

How many antinodes are present in the second harmonic of a standing wave in a material fixed at both ends?

• One

• Two

• Three

• Four

How many nodes are present in the third harmonic of a standing wave in a material fixed at both ends?

• Two

• Three

• Four

• Five

How are harmonics of standing waves numbered in a material fixed at both ends, according to the initial explanation?

• By the number of nodes

• By the number of antinodes

• By the wavelength

• By the frequency

What is another name for the first harmonic of a material?

• The overtone

• The fundamental mode

• The resonant frequency

• The primary wave

When a wave reaches a fixed endpoint, how does the reflected wave behave in relation to the original wave at that point?

• It is reflected and inverted, causing amplitudes to cancel out to zero.

• It is reflected without inversion, causing amplitudes to double.

• It passes through the endpoint unchanged.

• It is absorbed by the endpoint, with no reflection.