Answers3262 CR Physics B 2526Unit Test

Unit Test — Unit test Answers

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Yanni is sitting in the stands watching a football game. The quarterback runs forward toward the end zone and throws a pass straight downfield to a player for a touchdown. The quarterback ran at a speed of 8 m/s and threw the ball with a speed of 15 m/s.

A
For Yanni, the speed of the ball is 23 m/s, and for the quarterback, the speed of the ball is 15 m/s.
B
For Yanni, the speed of the ball is 15 m/s, and for the quarterback, the speed of the ball is 8 m/s.
C
For both Yanni and the quarterback, the speed of the ball is 23 m/s.
D
For both Yanni and the quarterback, the speed of the ball is 15 m/s.
2
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Which statement does Einstein’s theory promote about space and time?

A
Time, space, and the speed of light depend on reference frames.
B
Time and space depend on reference frames, but the speed of light does not.
C
The speeds of light and space depend on reference frames, but time does not.
D
The speeds of light and time depend on reference frames, but space does not.
3

Suppose a rocket is traveling through space and moving at a speed close to the speed of light. Three minutes pass on the rocket.

A
less than three minutes because of time dilation
B
more than three minutes because of time dilation
C
three minutes because time is absolute
D
less than or greater than three minutes depending on the speed
4

The emission spectrum of iodine is shown below.Which is the absorption spectrum?

Question illustration
A
A line spectra with 4 purple lines, 6 blue lines, 3 light blue lines, 5 green-blue lines, 6 green lines, 7 yellow lines, 3 orange lines and 14 red lines.
Option A
B
A line spectra with 6 purple lines, 9 blue lines, 6 light blue lines, 3 green-blue lines, 6 green lines, 2 yellow lines, 5 orange lines and 10 red lines.
Option B
C
A line spectra with 2 black lines in purple, 6 black lines in blue, 3 black lines in light blue, 1 black line in green-blue, 10 black lines in green, 8 black lines in yellow, 6 black lines in orange and 8 black lines in red.
Option C
D
A line spectra with 4 black lines in purple, 8 black lines in blue, 6 black lines in light blue, 3 black line in green-blue, 10 black lines in green, 4 black lines in yellow, 4 black lines in orange and 12 black lines in red.
Option D
5

A green dot in the middle of 4 concentric circles. The first away from the green dot is labeled n = 1. The second circle away from the green dot is labeled n = 2. The third circle away from the green dot is labeled n = 3 and the last is labeled n = 4. There is an arrow from n = 4 to n = 1 labeled A. There is an arrow from n = 3 to n = 2 labeled B. There is an arrow from n = 3 to n = 1 labeled C. There is an arrow from n = 2 to n = 1 labeled D.

Question illustration
A
A
B
B
C
C
D
D
6

Alana drew a diagram to compare the life cycles of low-mass and high-mass stars.

Question illustration
A
X: Nuclear fusion forms hydrogen in the main sequence star.Y: A white dwarf is part of the cycle.Z: A supernova is part of the cycle.
B
X: A white dwarf is part of the cycle.Y: Nuclear fusion forms hydrogen in the main sequence star.Z: A supernova is part of the cycle.
C
X: A protostar is part of the cycle.Y: It begins in a nebula.Z: nuclear fusion forms hydrogen in the main sequence star.
D
X: It begins in a nebula.Y: Nuclear fusion forms hydrogen in the main sequence star.Z: A protostar is part of the cycle.
7

After the supernova in a star’s life cycle, what else is formed in addition to a nebula?

A
red giant or protostar
B
neutron star or red giant
C
protostar or black hole
D
black hole or neutron star
8

Kathy drew a timeline to show some of the major events that occurred during the evolution of the universe.Which best describes Kathy’s error?

Question illustration
A
Quarks and electrons formed at 10–35 s, not 10–10 s.
B
Protons formed first, then neutrons formed at 100 s.
C
Nebulae formed around 109 y after hydrogen and helium formed.
D
Hydrogen and helium were created at 3000 s, before nebulae formed.
9

Changes in the appearance of emission and absorption spectrums are caused by the activities of

A
protons.
B
electrons.
C
neutrons.
D
neutrinos.
10

The presence of which element would indicate that a star is going through a high-mass star life cycle as opposed to a low-mass star life cycle?

A
hydrogen
B
carbon
C
helium
D
iron
11

Which statement is part of Bohr's atomic model?

A
Electrons absorb or emit light when they change energy levels.
B
Electrons with the highest energy are found with orbits of the smallest radius.
C
Electrons exist as waves and clouds of probability with specific orbits and shapes.
D
Electrons orbit the nucleus in narrow ellipses, like how the planets orbit the Sun.
12

A student has an unknown sample. How can spectroscopy be used to identify the sample?

A
It can identify the elements in the sample.
B
It can determine the number of electrons in the sample.
C
It can determine the ratio of the elements in the sample.
D
It can determine the molecular structure of atoms in the sample.
13

Basim’s robotics team builds a robot that travels at 9 m/s and can fire a tennis ball at a target.

A
The robot fires the ball forward with a speed of 7 m/s.
B
The robot fires the ball backward with a speed of 7 m/s.
C
The robot fires the ball backward with a speed of 2 m/s.
D
The robot fires the ball forward with a speed of 2 m/s.
14

What type of spectrum is shown below?

Question illustration
A
absorption
B
electromagnetic
C
emission
D
infrared light
15

An absorption spectrum of oxygen is shown below.What is most likely the emission spectrum of oxygen?

Question illustration
A
A rainbow for a line spectra. There are 4 lines in purple, 4 lines in blue, 3 lines in blue-green, 6 lines in the yellow, 4 lines in the orange and 15 lines in red.
Option A
B
A rainbow for a line spectra. There are 4 lines in purple, 4 lines in blue, 3 lines in blue-green, 7 lines in the green, 6 lines in the yellow, 5 lines in the orange and 10 lines in red.
Option B
C
A rainbow for a line spectra. There are 4 lines in purple, 4 lines in blue, 2 lines in blue-green, 4 lines in the green, 2 lines in the yellow, 3 lines in the orange and 4 lines in red.
Option C
D
A rainbow for a line spectra. There are 5 lines in purple, 6 lines in blue, 1 line in blue-green, 4 lines in the green, 3 lines in the yellow, 4 lines in the orange and 4 lines in red.
Option D
16

Victor drew a diagram to show the life cycle of a low-mass star.

Question illustration
A
red supergiant
B
black hole
C
white dwarf
D
supernova
17

Scientists discovered that stars in the universe are mostly composed of which elements?

A
hydrogen and helium
B
hydrogen and oxygen
C
oxygen and nitrogen
D
helium and nitrogen
18

Four students made a graphic organizer describing the parts of the atom.Which table best describes the parts of the atom?

A
A 3 column table with 3 rows. The first column is labeled particle with entries proton, electron, neutron. The second column is labeled charge with entries positive, 0, negative. The last column is labeled location with entries outside nucleus, outside nucleus, inside nucleus.
Option A
B
A 3 column table with 3 rows. The first column is labeled particle with entries proton, electron, neutron. The second column is labeled charge with entries negative, 0, negative. The last column is labeled location with entries inside nucleus, outside nucleus, inside nucleus.
Option B
C
A 3 column table with 3 rows. The first column is labeled particle with entries proton, electron, neutron. The second column is labeled charge with entries 0, negative, positive. The last column is labeled location with entries outside nucleus, inside nucleus, inside nucleus.
Option C
D
A 3 column table with 3 rows. The first column is labeled particle with entries proton, electron, neutron. The second column is labeled charge with entries positive, negative, 0. The last column is labeled location with entries inside nucleus, outside nucleus, inside nucleus.
Option D
19

As part of his special theory of relativity, Einstein saw mass as a form of .

Answer not available
20

What is the origin of all stars?

A
supernova
B
dwarfs
C
protostars
D
nebulae

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