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Atomic Spectra — Cumulative exam Answers

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Which statement is part of Dalton's atomic theory?

A
Matter is composed of small particles called atoms.
B
Atoms can be divided into their subatomic particles.
C
Atoms are able to be seen with proper spectroscopy equipment.
D
Chemical reactions can change atoms from one type to another.
22
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Which shows the correct order of processes leading up to the formation of a main sequence star?

A
Gases condense to form a nebula, gravity causes the nebula to collapse and spin, nuclear fusion occurs, and a protostar forms.
B
A protostar forms, nuclear fusion occurs, gases condense to form a nebula, and gravity causes the nebula to collapse and spin.
C
Gases condense to form a nebula, gravity causes the nebula to collapse and spin, a protostar forms, and nuclear fusion occurs.
D
A protostar forms, gases condense to form a nebula, gravity causes the nebula to collapse and spin, and nuclear fusion occurs.
23

What is the main difference between a permanent magnet and a temporary magnet?

A
A permanent magnet is made of a ferromagnetic material, while a temporary magnet is not.
B
A temporary magnet attracts only metal objects, while permanent magnets attract both metal objects and other magnets.
C
The domains in a temporary magnet easily lose alignment, but the domains in a permanent magnet keep their alignment.
D
There are domains in a permanent magnet, but not in a temporary magnet.
24

The speed of light in a vacuum is approximately 2.99 × 108 m/s, and the speed of light through a piece of glass is approximately 1.97 × 108 m/s.

A
0.66
B
1.52
C
1.02 × 108
D
4.96 × 108
25

What is the best description of a wave?

A
a pulse that carries energy
B
a disturbance that moves matter
C
a medium disturbed by a vibration
D
matter that is moved from one place to another
26

The ratio of coils of wire in the primary winding to the secondary winding of a transformer is 3:2. How does the transformer change the voltage of a current applied to the primary winding?

A
It increases to three-halves times the original.
B
It decreases to two-thirds the original.
C
It increases to three times the original.
D
It decreases to one-third the original.
27

Which electromagnetic wave transfers the least amount of energy?

A
gamma
B
X-ray
C
ultraviolet
D
microwave
28

Force F acts between two charges, q1 and q2, separated by a distance d.

A
F
Option A
B
F
Option B
C
F
D
2F
29

The two waves shown here are the same distance from point X and are traveling toward each other.

Question illustration
A
0.0 cm
B
1.0 cm
C
2.0 cm
D
4.0 cm
30

Which are characteristics of a ray when it hits a boundary and reflects, but not when it hits the boundary and refracts? Check all that apply.

A
changes direction
B
changes speed
C
does not change direction
D
does not change speed
E
bounces off the boundary
F
passes through the boundary
31

A –0.06 C charge is placed is in a uniform electric field with a strength of 200 N/C. What is the magnitude and direction of the force on the charge?

A
12 N in the opposite direction of the field
B
12 N in the same direction of the field
C
3333 N up in the opposite direction of the field
D
3333 N in the same direction of the field
32

Takumi works in his yard for 45 minutes each Saturday. He works in the morning, and he wears sunscreen and a hat each time he works in the yard.What does Takumi hope to reduce through his actions?

A
the likelihood of stochastic effects, such as DNA mutations
B
the severity of stochastic effects, such as cancer
C
the severity of non-stochastic effects, such as cancer
D
the likelihood of non-stochastic effects, such as radiation sickness
33

Once started, why can nuclear fission continue to occur on its own?

A
The thermal energy released can cause the products to join.
B
The neutron formed by the reaction can cause more nuclei to combine.
C
The thermal energy released can cause the products to split.
D
A neutron begins the reaction, and more neutrons are formed in it.
34

A wire is joined to points X and Y in the circuit diagram shown.How does the circuit change when the wire is added?

Question illustration
A
A closed circuit occurs and makes all bulbs turn off.
B
An open circuit occurs and makes all bulbs turn off.
C
A short circuit occurs and makes bulbs 3 and 4 turn off but keeps bulbs 1 and 2 lit.
D
A short circuit occurs and makes bulbs 1 and 2 turn off but keeps bulbs 3 and 4 lit.
35

A bell is rung. What best describes the density of air around the bell?

A
The air density does not change.
B
The air density increases and then returns to normal levels.
C
The air density decreases and then returns to normal levels.
D
The air density increases and decreases repeatedly before returning to normal.
36

Which diagram best illustrates the magnetic field of a bar magnet?

A
A bar magnet with a north and south pole. Field line vectors are leaving the north pole and curl around to the south pole.
Option A
B
A bar magnet with a north and south pole. Field line vectors are leaving the south pole and curl around to the north pole.
Option B
C
A bar magnet with a north and south pole. Field line vectors are leaving the north pole and curl around to the south pole.
Option C
D
A bar magnet with a north and south pole. Field line vectors are leaving the south pole and curl around to the north pole.
Option D
37

The diagram shows the electric field lines around two charges.

Question illustration
A
They are negative, and they repel.
B
The left is negative and the right is positive, so they attract.
C
The left is positive and the right is negative, so they attract.
D
They are positive, and they repel.
38

Emissions from alpha decay require the least amount of shielding.Which best describes why the emissions from alpha decay are so easily blocked compared to the emissions of other types of radioactive decay?

A
Alpha decay releases visible light, which has less energy than the light released during gamma decay.
B
Alpha decay releases particles that have less mass and charge than the particles released during beta decay.
C
Alpha decay releases particles that have less mass and charge than the particles released during gamma decay.
D
Alpha decay releases particles that have more mass and charge than the particles released during beta decay.
39

A positive rod is touched to a neutral sphere.

Question illustration
A
It is showing the direction that protons move in, making the sphere negative.
B
It is showing the direction that protons move in, making the sphere positive.
C
It is showing the direction that electrons move in, making the sphere positive.
D
It is showing the direction that electrons move in, making the sphere negative.
40

The diagram shows the electric field around two charged objects.

Question illustration
A
Y is negative, and Z is positive.
B
Y is negative, and Z is negative.
C
Y and Z are like charges, but their identities cannot be determined.
D
Y and Z are opposite charges, but their identities cannot be determined.

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