AnswersDCSS Physics CR 24-25Unit Test

Unit Test — Unit test Answers

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1
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A ray diagram shows an object placed between 2F and F of a convex lens. The image produced is

A
smaller than the object.
B
upright.
C
larger than the object.
D
virtual.
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

Which statement describes characteristics of a convex lens?

A
A convex lens diverges light and curves inward.
B
A convex lens diverges light and curves outward.
C
A convex lens converges light and curves inward.
D
A convex lens converges light and curves outward.
4

Kayla drew two ray diagrams to compare the behavior of light rays.

Question illustration
A
Diagram X shows reflection, and diagram Y shows refraction from a less dense to a denser medium.
B
Diagram X shows refraction from a less dense to a denser medium, and diagram Y shows reflection.
C
Diagram X shows reflection, and diagram Y shows refraction from a denser to a less dense medium.
D
Diagram X shows refraction from a denser to a less dense medium, and diagram Y shows reflection.
5

The diagram shows how an image is produced by a plane mirror.

Question illustration
A
W
B
X
C
Y
D
Z
6

Lexy and Jin study the diagram shown. Lexy says that the diffraction angle is the one labeled R, and Jin says that the diffraction angle is the one labeled S.

Question illustration
A
Lexy is correct because angle R is between the incident wave, n = 0, and a diffracted wave.
B
Lexy is correct because angle R includes the diffracted wave at n = 1.
C
Jin is correct because angle S is measured from the barrier and includes n = 2, the wave that has the most diffraction.
D
Jin is correct because angle S is between the dimmest order bands, n = 1 and n = 2.
7

When using the lens equation, a negative value as the solution for di indicates that the image is

A
real.
B
virtual.
C
upright.
D
inverted.
8

[BLANK]

A
greater than 45 degrees each
B
less than 45 degrees each
C
equal in measure
D
different in measure
9

Jaylen draws a diagram to show the behavior of light as it passes through an opening.

Question illustration
A
by drawing the arrows on the right side of the opening so they point outward instead of inward
B
by drawing the arrows on the left side of the diagram so they are parallel to the wave fronts instead of perpendicular
C
by drawing only two arrows on the right side of the opening, with one pointing upward and the other pointing downward
D
by drawing only two arrows on the left side of the diagram, with one parallel to the wave fronts and one perpendicular to the wave fronts
10

Which statement describes characteristics of a concave lens?

A
A concave lens diverges light and curves inward.
B
A concave lens diverges light and curves outward.
C
A concave lens converges light and curves inward.
D
A concave lens converges light and curves outward.
11

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.
12

What is the mirror formula for curved mirrors?

A
The inverse of f equals the inverse of d Subscript o Baseline times the inverse of d Subscript I Baseline.
Option A
B
The inverse of f plus the inverse of d Subscript o Baseline equals the inverse of d Subscript I Baseline.
Option B
C
The inverse of f equals the inverse of d Subscript o Baseline plus the inverse of d Subscript I Baseline.
Option C
D
The inverse of f equals the inverse of d Subscript o Baseline minus the inverse of d Subscript I Baseline.
Option D
13

A ray diagram is shown.

Question illustration
A
It shows an incident ray.
B
It shows that the ray is changing direction.
C
It shows the ray passing through the boundary.
D
It shows that angles form between the rays and the normal.
14

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.
15

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

Question illustration
A
water
B
air
C
glass
D
diamond
16

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.
17

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
18

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
19

What is the approximate wavelength of a light whose second-order dark band forms a diffraction angle of 15.0° when it passes through a diffraction grating that has 250.0 lines per mm?

A
26 nm
B
32 nm
C
414 nm
D
518 nm
20

A light with a second-order dark band forms a diffraction angle of 20.0°. The diffraction grating has 200.0 lines per mm.The wavelength of the light, to the nearest whole number, is nm.

Answer not available

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