mastering physics reading quiz ch 21 (superposition)

7/23/2019 Mastering Physics Reading Quiz Ch 21 (Superposition)

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Reading Quiz Ch 21 (Superposition)

Reading Question 21.04

The various possible standing waves on a string are called the

The various possible standing waves on a string are called the

antinodes.

resonant nodes.

normal modes.

incident waves.


The frequency of the third harmonic of a string is

one-third the frequency of the fundamental.

equal to the frequency of the fundamental.

three times the frequency of the fundamental.

nine times the frequency of the fundamental.


There are some points on a standing wave that never move. What are these points called?

Harmonics

Normal modes

Nodes

Antinodes

Interference


Two sound waves of nearly equal frequencies are played simultaneously. What is the name of the

acoustic phenomenon you hear if you listen to these two waves?



Beats

Diffraction

Harmonics

Chords

Interference


Two in-phase sources emit sound waves of equal wavelength and intensity. At the position of the dot,

The interference is constructive.

The interference is somewhere between constructive and destructive.

There's not enough information to tell about the interference.

The interference is destructive.




Two loudspeakers emit sound waves with the same wavelength and the same amplitude. The waves are

shown displaced, for clarity, but assume that both are traveling along the same axis. At the point where

the dot is,

the interference is constructive.

the interference is somewhere between constructive and destructive.

There's not enough information to tell about the interference.

the interference is destructive.


You hear 2 beats per second when two sound sources, both at rest, play simultaneously. The beats

disappear if source 2 moves toward you while source 1 remains at rest. The frequency of source 1 is 500

Hz. The frequency of source 2 is

496 Hz.

500 Hz.

498 Hz.

504 Hz.



502 Hz.


When a wave pulse on a string reflects from a boundary, how is the reflected pulse related to the incidentpulse?

Both the shape and amplitude are unchanged.

The shape is inverted, but the amplitude is unchanged

The shape is unchanged, but the amplitude is reduced.

The shape is inverted, and the amplitude is reduced .

The amplitude is unchanged, but the speed is reduced.


What is the wavelength of this standing wave?

2.0 m.

0.5 m.



1.0 m.

0.25 m.

Standing waves don't have a wavelength.

mastering physics reading quiz ch 21 (superposition)

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