Answers25-26 TX-Physics B-CRUnit Test

Unit Test — Unit test Answers

14 verified answers
1
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What does the index of refraction directly measure?

A
the angle between the incident ray and the normal line
B
the angle between the refracted ray and the normal line
C
the bending of light in a medium
D
the reflection of light in a medium
2
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What are some applications of the field of spectroscopy? Select 5 options. for identifying elements in a samplefor determining the distance and velocity of galaxiesfor producing neon lightsfor determining types of chemical bondsfor use in medical imaging devicesfor killing bacteria in foods

A
for identifying elements in a sample
B
for determining the distance and velocity of galaxies
C
for producing neon lights
D
for determining types of chemical bonds
E
for use in medical imaging devices
F
for killing bacteria in foods
3

A spring supporting a mass of 30 kg compresses 0.6 m. How far does the spring compress when it supports a mass of 10 kg?

A
0.1 m
B
0.2 m
C
1.2 m
D
1.8 m
4

The emission spectrums are known for the elements below.What elements are in the unknown sample? Select 2 options. boronlithiumhydrogenheliumpotassium

Question illustration
A
boron
B
lithium
C
hydrogen
D
helium
E
potassium
5

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
6

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

The diagram shows an image of an object being reflected off a plane mirror.

Question illustration
A
W
B
X
C
Y
D
Z
9

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.
10

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
11

When light from one source, X, strikes a metal, electrons are ejected. When light from another source, Y, strikes the same metal, electrons are not ejected.

A
Light from source X has a higher intensity than light from source Y.
B
Light from source X has a lower intensity than light from source Y.
C
Photons of light from source X carry more energy than photons of light from source Y.
D
Photons of light from source X carry less energy than photons of light from source Y.
12

A photon has 8.0 × 10–15 J of energy. Planck’s constant is 6.63 × 10–34 J•s.

A
1.21 × 1019 Hz
B
8.3 × 10–20 Hz
C
1.21 × 10–19 Hz
D
8.3 × 1020 Hz
13

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.
14

Which idea did Isaac Newton’s experiments with light support?

A
Light is produced by the interaction of magnetic and electric fields.
B
Light is a wave because it has properties that are similar to radio waves.
C
Light is made of particles because it travels only in a straight path.
D
Light is a wave because it bends around barriers.
15

Dierdre drew a diagram to compare the three types of mirrors.

Question illustration
A
X: Curves inwardY: Image may be larger than objectZ: Image is always real
B
X: Image is always virtualY: Curves outwardZ: Image may be smaller than object
C
X: Image is always realY: Curves inwardZ: Image may be smaller than object
D
X: Curves outwardY: Image may be smaller than objectZ: Image is always virtual

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