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21
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What do MRI and ultrasound have in common as diagnostic imaging techniques? Choose three correct answers.

A
tomographic imaging
B
low risk for tissue damage
C
noninvasive
D
no radiation
E
uses radio waves
22
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Which list provides evidence for the general theory of relativity?

A
gravitational redshift, changes in a planet’s orbital path, gravitational lensing
B
changes in a planet’s orbital path, curvature of space-time, length contraction
C
gravitational lensing, constancy of the speed of light, curvature of space-time
D
constancy of the speed of light, gravitational redshift, gravitational lensing
23

Force cap f acts between two charges, q sub 1 and q sub 2 , separated by a distance d If q sub 1 is increased to twice its original value and the distance between the charges is also doubled, what is the new force acting between the charges in terms of cap f ?

A
1 fourth cap f
B
1 half cap f
C
cap f
D
2 cap f
24

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
does not change speed
B
bounces off the boundary
C
changes direction
D
changes speed
E
passes through the boundary
F
does not change direction
25

Which lists the correct steps that occur when using a diffraction grating to bend light?

A
diffracted wavelengths reach the eyes right arrow the eyes see different colors right arrow light strikes the grooves right arrow different wavelengths of light bend at different angles
B
light strikes the grooves right arrow different wavelengths of light bend at different angles right arrow diffracted wavelengths reach the eyes right arrow the eyes see different colors
C
diffracted wavelengths reach the eyes right arrow different wavelengths of light bend at different angles right arrow the eyes see different colors right arrow light strikes the grooves
D
different wavelengths of light bend at different angles right arrow light strikes the grooves right arrow diffracted wavelengths reach the eyes right arrow the eyes see different colors
26

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

A
the type of metal of the wire
B
the direction of the current
C
the distance from the wire
D
the amount of the current
E
the temperature of the wire
29

Haley noticed a small spot on her skin that turned out to be skin cancer. Which treatment is her doctor most likely to use?

A
superficial external beam radiation therapy
B
brachytherapy
C
high intensity focused ultrasound
D
radiopharmaceuticals
30

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:

4.8399×10^-50 J

31

Which changes in an electric motor will make the motor stronger? Choose three correct answers.

A
using a weaker permanent magnet
B
increasing the distance between the magnets
C
increasing current in the electromagnet
D
decreasing current in the electromagnet
E
using a stronger permanent magnet
F
decreasing the distance between the magnets
32

Which electromagnetic wave transfers the least amount of energy?

A
gamma
B
microwave
C
ultraviolet
D
cap x -ray
33

Which statement is part of Dalton's atomic theory?

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

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

A
Image with description A bar magnet with a north and south pole. Field line vectors are leaving the south pole and curl around to the north pole.
B
Image with description A bar magnet with a north and south pole. Field line vectors are leaving the north pole and curl around to the south pole.
C
Image with description A bar magnet with a north and south pole. Field line vectors are leaving the south pole and curl around to the north pole.
D
Image with description A bar magnet with a north and south pole. Field line vectors are leaving the north pole and curl around to the south pole.
35

Which statements describe a fully charged capacitor? Choose three correct answers.

A
There is no potential difference between the plates.
B
Electric potential energy is released.
C
Electric potential energy is stored.
D
There is a potential difference between the plates.
E
Both plates have the same type of charge.
F
Both plates have the same amount of charge.
36

A charge of 8 point 4 times 10 to the negative 4 power cap c moves at an angle of 35 degrees to a magnetic field that has a field strength of 6 point 7 times 10 to the negative 3 power T If the magnetic force is 3 point 5 times 10 to the negative 2 power cap n , how fast is the charge moving?

A
1 point 3 times 10 to the negative 4 power m/s
B
1 point 1 times 10 to the 4th power m/s
C
9 point 1 times 10 to the negative 5 power m/s
D
7 point 6 times 10 cubed m/s
37

A 650 times 10 to the negative 4 power cap f capacitor stores 24 times 10 to the negative 3 power of charge. What is the potential difference between the plates?

A
2 point 7 cap v
B
0 point 3 7 cap v
C
0 point 0 8 9 cap v
D
0 point 0 0 1 6 cap v
38

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
2 point 0 cap omega
B
1 point 1 cap omega
C
2 point 3 cap omega
D
0 point 5 0 cap omega
39

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 particles that have less mass and charge than the particles 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 beta decay.
D
Alpha decay releases visible light, which has less energy than the light released during gamma decay.
40

A lightbulb has a resistance of 195 cap omega and carries a current of 0 point 6 2 cap A

Answer:

120.9

41

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 decreases to one-third the original.
B
It increases to three times the original.
C
It decreases to two-thirds the original.
D
It increases to three-halves times the original.
42

The power rating of a clock is 10 cap w , and the cost of electrical energy is 0 point 1 5 dollars per kilowatt-hour. Rounded to the nearest cent, how much does it cost to run the clock for one whole week?

A
0 point 0 4 dollars
B
0 point 2 5 dollars
C
1 point 6 8 dollars
D
11 point 2 0 dollars

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