Answers26-27 IC Physics 7614BWave Properties

Wave Properties — Unit test Answers

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1
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As the frequency of electromagnetic waves increases, what happens to the wavelength?

A
It increases.
B
It decreases.
C
It fluctuates.
D
It remains constant.
2
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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
3

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
4

Light strikes a smooth wooden tabletop.

A
The light rays bounce off the table and all move in the same direction.
B
The light rays bounce off the table and move in different directions.
C
The light rays pass through the table and all move in the same direction.
D
The light rays pass through the table and move in different directions.
5

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
6

What do all electromagnetic waves have in common?

A
They can travel at the speed of light.
B
They have the same wavelengths.
C
They travel only through matter.
D
They have nonmoving magnetic fields.
7

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.
8

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.
9

A cell phone company relies on which kind of waves in order to provide service for its customers?

A
ultraviolet waves
B
infrared waves
C
gamma rays
D
microwaves
10

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
11

A ray diagram for a refracted light ray is shown.

Question illustration
A
medium
B
boundary
C
normal
D
incident ray
12

Which is the correct formula for finding the frequency of an electromagnetic wave?

A
f = c –
Option A
B
f =
Option B
C
f = + c
Option C
D
f =
Option D
13

Rays of light strike a bumpy road and are reflected.

A
They will not follow the law of reflection.
B
Each will reflect at the exact same angle of reflection.
C
They will all travel in the same direction.
D
Each will reflect at an angle equal to its angle of incidence.
15

A ray diagram is shown.

Question illustration
A
index of refraction
B
index of reflection
C
angle of incidence
D
angle of refraction
16

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

Question illustration
A
W
B
X
C
Y
D
Z
19

A ray of light strikes a smooth surface and is reflected. The angle of incidence is 35°.

A
Rays will bounce in all directions, so the angle of reflection will be random.
B
Rays will bounce in all directions, so the angle of reflection will be less than 35°.
C
Rays will follow the law of reflection, so the angle of reflection will be 35°.
D
Rays will follow the law of reflection, so the angle of reflection will be random.
20

A lab technician needs to clean medical instruments that have been exposed to bacteria. Which electromagnetic wave would be most useful for this task?

A
infrared
B
radio
C
ultraviolet
D
microwave
21

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.
22

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.
23

Which formula represents Snell’s law?

A
n Subscript 1 Baseline plus sin theta Subscript 1 equals n Subscript 2 Baseline plus sin theta Subscript 2
Option A
B
Option
Option B
C
Option
Option C
D
Option
Option D

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