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N/A — Exam Answers

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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 more 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 less mass and charge than the particles released during beta decay.
26
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An ideal pendulum is often discussed when studying simple harmonic motion. What are the conditions needed for an ideal pendulum? Choose three correct answers.

A
The pivot on which the pendulum swings is frictionless.
B
Gravitational force acts to pull the pendulum’s mass down.
C
The mass of the rod of the pendulum is evenly distributed along the rod.
D
The pendulum swings through its equilibrium position as a result of inertia.
E
Tension acts downward on the pendulum’s mass.
27

Which best explains why infrared waves are ineffective for treating cancer?

A
They have short wavelengths, which can be harmful to healthy cells.
B
They have frequencies that are too high to kill cancer cells.
C
They do not transfer enough energy to destroy cancer cells.
D
They have long wavelengths, which can be harmful to healthy cells.
28

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

A
It increases to three times the original.
B
It increases to three-halves times the original.
C
It decreases to one-third the original.
D
It decreases to two-thirds the original.
29

Which are characteristics of a ray when it hits a boundary and reflects, but not when it hits the boundary and refracts? Choose two correct answers.

A
changes direction
B
changes speed
C
passes through the boundary
D
bounces off the boundary
E
does not change speed
F
does not change direction
30

A negative 0 point 0 6 cap c charge is placed is in a uniform electric field with a strength of 200 cap n over cap c What is the magnitude and direction of the force on the charge?

A
3333 cap n up in the opposite direction of the field
B
12 cap n in the same direction of the field
C
3333 cap n in the same direction of the field
D
12 cap n in the opposite direction of the field
31

A photon has a frequency of 7 point 3 times 10 to the negative 17 power Hz Planck’s constant is 6 point 6 3 times 10 to the negative 34 power times cap j times s

Answer:

4.84e-16

32

Two identical waves are traveling toward each other in the same medium. One has a positive amplitude, meaning that its peaks only go upward, and the other wave has a negative amplitude, with peaks going downward. What will occur when the waves peak at the same place at the same time?

A
wave refraction
B
destructive interference
C
constructive interference
D
a reflecting wave
33

Which statement is part of Dalton's atomic theory?

A
Atoms can be divided into their subatomic particles.
B
Atoms are able to be seen with proper spectroscopy equipment.
C
Matter is composed of small particles called atoms.
D
Chemical reactions can change atoms from one type to another.
34

A scientist wants to create a new material using nanotechnology. In which size range will she be working?

A
1 nm to 100 nm
B
100 to 10,000 nm
C
100 to 1000 nm
D
1 to 10,000 nm
36

Which electromagnetic wave transfers the least amount of energy?

A
cap x -ray
B
microwave
C
ultraviolet
D
gamma
37

Which factors affect the strength of a magnetic field around a current-carrying wire? Choose two correct answers.

A
the amount of the current
B
the distance from the wire
C
the type of metal of the wire
D
the temperature of the wire
E
the direction of the current
38

Which force is sometimes attractive and has an infinite range?

A
strong nuclear
B
weak nuclear
C
electromagnetic
D
gravitational
39

The distance between a charge and the source of an electric field changes from 3 millimeters to 6 millimeters

Answer:

divided by 2

40

What is the resistance in a circuit that carries a 0 point 7 5 cap A current when powered by a 1 point 5 cap v battery?

A
1 point 1 cap omega
B
0 point 5 0 cap omega
C
2 point 3 cap omega
D
2 point 0 cap omega
41

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
There are domains in a permanent magnet, but not in a temporary magnet.
C
The domains in a temporary magnet easily lose alignment, but the domains in a permanent magnet keep their alignment.
D
A temporary magnet attracts only metal objects, while permanent magnets attract both metal objects and other magnets.
42

Aluminum has a frequency threshold of 9 point 8 4 6 times 10 to the 14th power Hz Which best explains what will happen when light with a frequency below the frequency threshold strikes aluminum?

A
Electrons will be ejected immediately.
B
Electrons will start being ejected several seconds after the light strikes the aluminum.
C
No electrons will be ejected.
D
No electrons will be ejected unless the intensity is very high.
43

Based on the field lines, what is the best description of the charges?

A
They are negative, and they repel.
B
The left is positive and the right is negative, so they attract.
C
They are positive, and they repel.
D
The left is negative and the right is positive, so they attract.
44

What is the role of the part in the diagram labeled X?

A
change the amplitude and frequency of waves
B
capture, amplify, and demodulate waves
C
modulate, amplify, and send out waves
D
change the pulse and phase of waves
45

By which factor is the sound intensity decreased at 3 meters?

A
1 third
B
1 fourth
C
1 half
D
1 ninth

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