AnswersCrowley Credit Recovery Physics BUnit Test

Unit Test — Unit test Answers

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1
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A ray diagram is shown.

Question illustration
A
The diagram shows refraction, and medium 1 is denser than medium 2.
B
The diagram shows refraction, and medium 1 is less dense than medium 2.
C
The diagram shows reflection, and medium 1 is less dense than medium 2.
D
The diagram shows reflection, and medium 1 is denser than medium 2.
2
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Which is the destructive interference formula for diffraction grating problems?

A
dsin =
Option A
B
dcos =
Option B
C
dcos = n
Option C
D
dsin = n
Option D
3

The chart shows the speed at which light travels through different media.

Question illustration
A
water
B
air
C
glass
D
diamond
4

Which best describes reflection and refraction?

A
In both reflection and refraction, rays pass through a boundary.
B
In both reflection and refraction, rays bounce off a boundary.
C
In reflection, rays bounce off a boundary, and in refraction, rays pass through a boundary.
D
In refraction, rays bounce off a boundary, and in reflection, rays pass through a boundary.
5

Serena draws a diagram to compare what happens when rays hit a boundary and are either reflected or refracted.

Question illustration
A
X: ray bounces off a boundary and maintains constant speed Y: ray changes direction Z: ray passes through a boundary and changes speed
B
X: ray bounces off a boundary and changes speed Y: ray changes direction Z: ray passes through a boundary and maintains constant speed
C
X: ray bounces off a boundary and changes direction Y: ray maintains constant speed Z: ray passes through a boundary and does not change direction
D
X: ray bounces off a boundary and does not change directionY: ray maintains constant speed Z: ray passes through a boundary and changes direction
6

Remote controls rely on waves to carry signals and transmit information over short distances.

Answer not available
7

Simon draws a diagram to illustrate the law of reflection.

Question illustration
A
Draw the incident ray so it is longer than the reflected ray.
B
Make the angle of reflection and the angle of incidence equal.
C
Switch the labels for incident ray and reflected ray.
D
Make the angle of incidence larger than the angle of reflection.
8

Heinrich Hertz used properties of which type of wave to support the idea that light is also made of waves?

A
infrared
B
gamma
C
microwave
D
radio
9

Light with a wavelength of about 510 nm is made to pass through a diffraction grating. The angle formed between the path of the incident light and the diffracted light is 12.0° and forms a first-order bright band.The number of lines per mm in the diffraction grating, rounded to the nearest whole number, is lines per mm.

Answer not available
10

Which best describes what happens to sunlight after it passes through the keyhole of a door?

A
It converges into one particular shadow region.
B
It spreads out into multiple shadow regions.
C
It bends back toward the door.
D
It scatters back toward the door.
12

Which best explains how the diffraction pattern observed in Young’s experiment supports the wave theory of light?

A
The pattern was caused by light moving in a straight path.
B
The pattern was caused by light being separated into colors.
C
The pattern was caused by the interference of waves.
D
The pattern was caused by the reflection of waves.
13

Which image best illustrates diffraction?

A
A picture of a few clouds covering the sun and streams of light coming through the clouds.
Option A
B
A photo of a water lily floating on the water.
Option B
C
A picture of a straw in a glass of water showing the shift in position of the straw due to the water.
Option C
D
A picture of a rainbow.
Option D
14

Radio stations use electromagnetic waves for broadcasting. The chart shows different frequencies of waves used by radio stations.

Question illustration
A
W
B
X
C
Y
D
Z
15

The distance between slits on a diffraction grating is 0.60 mm, and one of the angles of diffraction is 0.30°. The light forms a second-order bright band.

A
1047 nm
B
1571 nm
C
3142 nm
D
6284 nm
16

What is the approximate wavelength of a light whose first-order bright band forms a diffraction angle of 45.0° when it passes through a diffraction grating that has 500.0 lines per mm?

A
236 nm
B
353 nm
C
943 nm
D
1414 nm
17

Which lists the waves in order of frequency, from highest to lowest?

A
X-rays, gamma rays, ultraviolet
B
radio waves, visible light, X-rays
C
ultraviolet, microwaves, gamma rays
D
visible light, infrared, microwaves
18

A(n) _______ is a line in which waves move that are moving together all in the same phase

A
Light wave
B
Wave front
C
Incident beam
D
Dark wave
19

The diagram shows changing wavelengths along the electromagnetic spectrum.

Question illustration
A
Y: UltravioletZ: Radio
B
Y: Gamma raysZ: Visible light
C
Y: X-raysZ: Infrared
D
Y: RadioZ: Gamma rays
21

Which describes the relationship between the frequency, wavelength, and speed of a wave as the wave travels through different media?

A
As speed changes, wavelength changes and frequency remains constant.
B
As speed changes, frequency changes and wavelength remains constant.
C
As speed changes, wavelength and frequency change.
D
As speed changes, wavelength and frequency remain constant.
22

The diagram shows a spectrometer being used to analyze a sample of a solution.

Question illustration
A
W
B
X
C
Y
D
Z

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