AnswersBHS-Physics B-CRUnit Test

Unit Test — Unit test Answers

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1
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Which is an everyday example of a diffraction grating?

A
A picture of the bottom of a CD or DVD showing rainbow lies going out from the center.
Option A
B
A picture of an upright mirror.
Option B
C
A picture of wave peaks in water.
Option C
D
A picture of bubbles.
Option D
2
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Sawyer is studying diffraction. He draws a diagram of a plane wave to show how light waves travel.

Question illustration
A
The wave fronts should be perpendicular to the direction in which the waves move.
B
The arrow showing the direction of movement of the waves should be pointing to the left.
C
The arrow showing the direction of movement of the waves should be pointing downward.
D
The wave fronts should be both parallel and perpendicular to the direction in which the waves move.
3

Which accurately explains concave and convex lenses?

A
With both concave and convex lenses, placement of the object dictates which side of the lense the image will appear.
B
With both concave and convex lenses, placement of the object does not dictate which side of the lense the image will appear.
C
With concave lenses, placement of the object does not dictate which side of the lense the image will appear, but with convex lenses, they do.
D
With convex lenses, placement of the object does not dictate which side of the lense the image will appear, but with concave lenses, they do.
4

The diagram shows monochromatic light passing through two openings.

Question illustration
A
constructive interference in which waves cancel each other out
B
constructive interference in which waves strengthen each other
C
destructive interference in which waves cancel each other out
D
destructive interference in which waves strengthen each other
5

A light with a second-order bright band forms a diffraction angle of 30.0°. The diffraction grating has 250.0 lines per mm.What is the wavelength of the light?

A
800 nm
B
1,000 nm
C
1,386 nm
D
1,732 nm
6

Walt made a study chart listing uses for two types of electromagnetic waves.

Question illustration
A
A: Infrared WavesB: X-rays
B
A: MicrowavesB: Ultraviolet Waves
C
A: Ultraviolet WavesB: Gamma Rays
D
A: X-raysB: Radio Waves
7

Which shows the correct magnification equation?

A
StartFraction h Subscript I Baseline over h Subscript o Baseline EndFraction equals negative StartFraction d Subscript I Baseline over d Subscript o Baseline EndFraction.
Option A
B
StartFraction h Subscript I Baseline over h Subscript o Baseline EndFraction equals StartFraction d Subscript I Baseline over d Subscript o Baseline EndFraction.
Option B
C
StartFraction d Subscript I Baseline over d Subscript o Baseline EndFraction equals negative StartFraction h Subscript I Baseline over d Subscript o Baseline EndFraction.
Option C
D
StartFraction d Subscript I Baseline over d Subscript o Baseline EndFraction equals StartFraction h Subscript I Baseline over d Subscript o Baseline EndFraction.
Option D
8

A ray diagram is shown.

Question illustration
A
W
B
X
C
Y
D
Z
9

Incident ray X passes parallel to the principal axis of a concave lens. Incident ray Y passes parallel to the principal axis of a convex lens.

A
Ray X continues moving in the same direction, and ray Y refracts and passes through the focal point located behind the lens.
B
Both rays refract and move as though they passed through the focal point.
C
Ray X appears as though it passed through the focal point in front of the lens, and ray Y passes through the focal point on the other side of the lens.
D
Both rays continue moving in the same direction.
10

Yellow light has a frequency of 5.2 × 1014 Hz and travels at a speed of 3.0 × 108 m/s. What is the wavelength of yellow light, in meters?

A
5.8 × 10–7 m
B
2.2 × 10–6 m
C
1.7 × 106 m
D
8.2 × 1022 m
11

A 12.0 cm object is 9.0 cm from a convex mirror that has a focal length of -4.5 cm. What is the distance of the image from the mirror?

A
–3 cm
B
–4 cm
C
3 cm
D
4 cm
12

Which lists the waves in order of wavelength, from longest to shortest?

A
X-rays, infrared, radio waves
B
infrared, visible light, gamma rays
C
ultraviolet, microwaves, visible light
D
radio waves, gamma rays, visible light
13

A patient is receiving treatments for brain cancer. Which electromagnetic waves are most likely being used as part of the treatment?

A
infrared
B
ultraviolet
C
microwave
D
gamma ray
14

A ray diagram shows the ray passing from medium 1 to medium 2. After passing into medium 2, the ray bends away from the normal.

A
reflection with scattering in a medium
B
reflection without scattering in a medium
C
refraction with medium 1 denser than medium 2
D
refraction with medium 1 less dense than medium 2
15

Arnold makes a chart to summarize what happens when light interacts with matter and is reflected.Which idea does Arnold need to correct?

Question illustration
A
In specular reflection, reflected rays move in the same direction.
B
In scattering, light strikes particles in the atmosphere.
C
In diffuse reflection, reflected rays move in different directions.
D
In scattering, long wavelengths are scattered the most.

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