AnswersBHS-Physics B-CRUnit Test

Unit Test — Unit test Answers

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1
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What best describes a possible transfer of energy?

A
A mechanical wave transfers energy through matter.
B
A longitudinal wave transfers energy perpendicular to wave motion.
C
A transverse wave transfers energy parallel to wave motion.
D
A sound wave does not need a medium to transfer energy through.
2
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Which best explains why sound travels fastest through a solid?

A
Sound is a mechanical wave, so closer molecules in the medium cause energy to transfer faster.
B
Sound is a mechanical wave, so if the volume of the medium is greater, more energy is transferred.
C
Sound is an electromagnetic wave, so the medium does not affect the speed.
D
Sound is an electromagnetic wave, so a greater amplitude results in a greater speed.
3

A tuning fork is vibrating the air around it. What best describes the waves produced by the tuning fork?

A
mechanical, because the air molecules are moving perpendicular to the tuning fork
B
mechanical, because the vibrating tuning fork makes air molecules around it vibrate
C
electromagnetic, because the air molecules are moving parallel to the tuning fork
D
electromagnetic, because the vibrating tuning fork does not need air in order to produce sound
4

A marching band is practicing. The band director sees the drum major hit a drum. How far away is the director if he hears the drumbeat in 0.40 seconds? The speed of sound is 330 m/s.

A
12 m
B
132 m
C
264 m
D
825 m
5

Which diagram best shows the perceived sound wave heard by a woman after a police car has passed her?

A
An illustration of a person listening to the siren of a passing police car. There are circles spreading out from the siren with the wavelength close together in the front and farther apart in the back.
Option A
B
An illustration of a person listening to the siren of a passing police car. There are circles spreading out from the siren with the wavelength longer closer to the siren and closer together the farther from the siren on both sides.
Option B
C
An illustration of a person listening to the siren of a passing police car. There are circles spreading out from the siren that are concentric and evenly spaced.
Option C
D
An illustration of a person listening to the siren of a passing police car. There are circles spreading out from the siren with the wavelength changing in all directions.
Option D
6

What best describes a sound wave?

A
transverse and electromagnetic
B
longitudinal and mechanical
C
longitudinal and electromagnetic
D
transverse and mechanical
7

The two waves in the diagram are occupying the same place at the same time.At what time will the interfering waves have an amplitude of zero?

Question illustration
A
1.0
B
3.0
C
4.0
D
7.0
8

A lens focuses light at a single point called the focal point.

Question illustration
A
absorption
B
diffraction
C
reflection
D
refraction
9

A sound wave travels through water. What best describes the direction of the water particles?

A
The water particles move perpendicular to the source of the sound wave.
B
The water particles move in the same direction as the vibrating source of the sound wave.
C
The water particles move in random patterns because the sound is diffracted in many directions.
D
The water particles do not move because the sound wave does not have enough energy.
10

How are electromagnetic waves different than all other waves?

A
They can be transmitted.
B
They can be reflected.
C
They can vibrate matter.
D
They can travel through space.
11

An ambulance emits a frequency of 450 Hz from its siren. What frequency is heard by a man as the ambulance moves toward him?

A
less than 450 Hz
B
more than 450 Hz
C
450 Hz
D
0 Hz
12

The diagram shows a wave traveling through a medium.

Question illustration
A
amplitude
B
crest
C
trough
D
wavelength
13

When a DVD is played, a laser light hits the surface of the disk and then returns to the detector.

Question illustration
A
absorption
B
interference
C
reflection
D
refraction
14

A is a point on a standing wave that appears to be stationary.

Answer not available
15

Following a lecture on transverse and longitudinal waves, four students make Venn diagrams to characterize these waves.Which Venn diagram is correct?

A
A Venn diagram with two intersecting circles. The circle on the left is labeled transverse waves with entries light, can travel through a vacuum, vibrating string, created by a disturbance and medium motion is perpendicular. The circle on the right is labeled longitudinal waves with entries medium motion is parallel, has regions of high and low density, sound and travel faster in a denser medium. The overlapping region has entries has speed and travels through solids.
Option A
B
A Venn diagram with two intersecting circles. The circle on the left is labeled transverse waves with entries light, can travel through a vacuum, vibrating string and medium motion is perpendicular. The circle on the right is labeled longitudinal waves with entries medium motion is parallel, has regions of high and low density, sound and travel faster in a denser medium. The overlapping region has entries, created by a disturbance, has speed and travels through solids.
Option B
C
A Venn diagram with two intersecting circles. The circle on the left is labeled transverse waves with entries light, all parts of the electromagnetic spectrum, vibrating string, medium motion is perpendicular. The circle on the right is labeled longitudinal waves with entries medium motion is parallel, has regions of high and low density, sound and can travel through a vacuum. The overlapping region has entries, created by a disturbance, has speed and travels through solids.
Option C
D
A Venn diagram with two intersecting circles. The circle on the left is labeled transverse waves with entries light, can travel through a vacuum, vibrating string and medium motion is perpendicular. The circle on the right is labeled longitudinal waves with entries medium motion is parallel, has regions of high and low density, all parts of the electromagnetic spectrum and travel faster in a denser medium. The overlapping region has entries, created by a disturbance, has speed and travels through solids.
Option D
16

A sound with an intensity greater than dB can cause damage to human ears.

Answer not available
17

A source emits a sound and is represented by the red dot in this map. Four people are located around the source, and the circles represent the sound wave.

Question illustration
A
person A
B
person B
C
person C
D
person D
18

absorbedtransmittedreflectedrefracted

A
absorbed
B
transmitted
C
reflected
D
refracted
19

A sound wave travels through air. In which regions are air molecules the least dense?

A
compressions
B
frequencies
C
pitches
D
rarefactions
20

Two pulses are moving along a string. One pulse is moving to the right and the second is moving to the left. Both pulses reach point P at the same instant.

Question illustration
A
An illustration with the triangular trough in the middle of the rectangular crest to the left of point P.
Option A
B
An illustration with the triangular trough in the middle of the rectangular crest to the right of point P.
Option B
C
An illustration with a rectangular crest moving toward the right past P and a triangular trough going toward the left past P.
Option C
D
An illustration with a rectangular crest moving toward the left and a triangular trough going toward the right both away from point P and equidistant from P.
Option D

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