AnswersDCSS Physics CR 24-25Unit Test

Unit Test — Unit test Answers

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1
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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
2
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A box that has a weight of 40 N is hung from a spring. The spring constant of the spring is 400 N/m.

A
0.1 cm
B
1 cm
C
10 cm
D
100 cm
3

Trevor places a mass on a spring. When he releases it, the mass and spring move in simple harmonic motion.

A
He could use a longer spring.
B
He could use a smaller mass.
C
He could use a stiffer spring.
D
He could pull the mass down farther.
4

An object that is in simple harmonic motion is restored to its equilibrium position due to a force that is proportional to which quantity?

A
tension
B
velocity
C
displacement
D
period
5

Two waves are shown. Each wave has the same frequency and velocity. However, Wave B carries more energy.

Question illustration
A
amplitude
B
period
C
velocity
D
wavelength
6

Yung hangs a mass from a rod, sets the pendulum in simple harmonic motion, and determines the period of the pendulum. How could Yung decrease the period of the pendulum?

A
He could use a longer rod.
B
He could use a shorter rod.
C
He could use a larger mass.
D
He could use a smaller mass.
7

Consider the intensities of the sounds listed below.

Question illustration
A
busy roadway, kids whispering, average home
B
chainsaw, diesel truck, rustling leaves
C
kids whispering, vacuum cleaner, jet airplane
D
library, conversational speech, music from speaker
8

The diagrams show the sound waves produced in one second from various tuning forks.Which sound wave has the lowest pitch?

A
An illustration of a tuning fork with lines parallel to the fork moving out. The lines start out farther apart, get closer together and then farther apart again.
Option A
B
An illustration of a tuning fork with lines parallel to the fork moving out. The lines start out farther apart, get closer together and then farther apart again. The line pattern then repeats.
Option B
C
An illustration of a tuning fork with lines parallel to the fork moving out. The lines start out close together, get farther apart and then close together again. The line pattern then repeats.
Option C
D
An illustration of a tuning fork with lines parallel to the fork moving out. The lines start out close together, get farther apart and then close together again. The line pattern then repeats. The farther apart section gets wider the further the lines are from the fork.
Option D
9

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
10

As the distance of a sound wave from its source quadruples, how is the intensity changed?

A
it increases by a factor of 4
B
it increases by a factor of 16
C
it decreases by a factor of 4
D
it decreases by a factor of 16
11

[BLANK]

A
displacement
B
acceleration
C
net force
D
velocity
12

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
13

Mateo adds two labels to the Venn diagram shown to explain how velocity and acceleration change during simple harmonic motion.Label 1: Zero at the equilibrium positionLabel 2: Increases with increasing net force

Question illustration
A
Label 1: ZLabel 2: Z
B
Label 1: XLabel 2: Z
C
Label 1: YLabel 2: Y
D
Label 1: ZLabel 2: X
14

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.
15

A sound wave has a frequency of 425 Hz. What is the period of this wave?

A
0.00235 seconds
B
0.807 seconds
C
425 seconds
D
850 seconds
16

Look at the diagram.

Question illustration
A
A
B
B
C
C
D
D
17

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

Question illustration
A
absorption
B
diffraction
C
reflection
D
refraction
18

A frequency generator sends a 550 Hz sound wave through both water and ice.

Question illustration
A
2.1 m
B
3.1 m
C
5.2 m
D
8.5 m
19

The diagram represents wavelengths of different colors of visible light that pass by in a specific time period.

Question illustration
A
red
B
yellow
C
blue
D
violet
20

What best describes the relationship between wavelength and frequency in an electromagnetic wave?

A
always equal
B
no relationship
C
directly proportional
D
inversely proportional

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