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What is the best prediction for what will happen when all of the hydrogen in the Sun has undergone fusion?

A
Helium nuclei will fuse to create heavier elements, and the Sun will continue to release energy.
B
Helium nuclei will split to form hydrogen, and the Sun will continue to release energy.
C
Helium nuclei will fuse to create heavier elements, but the Sun will no longer release energy.
D
Helium nuclei will split to form hydrogen, and the Sun will no longer release energy.
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The speed of light in a vacuum is approximately 2.99 meters meters per second , and the speed of light through a piece of glass is approximately 1.97 meters meters per second What is the index of refraction for the piece of glass?

A
4 point 9 6 times 10 to the 8th power
B
0 point 6 6
C
1 point 5 2
D
1 point 0 2 times 10 to the 8th power
45

At night, the demand for electricity supplied by a fission nuclear reactor decreases. How is the fission nuclear reaction controlled to avoid overproduction of electricity?

A
The exposure between the fuel rods and a neutron-absorbing material is increased.
B
The exposure between the fuel rods and a neutron-absorbing material is reduced.
C
The temperature of the reactor is raised because the reaction slows down at higher temperatures.
D
The temperature of the reactor is lowered because high temperature and pressure are needed.
46

How much time was required? A current of 1 point 8 cap A delivers 2 point 5 cap c of charge.

A
4 point 5 s
B
1 point 4 s
C
0 point 7 2 s
D
0 point 7 0 s
47

What is the bes t conclusion about the charges that can be made based on the diagram?

A
Y and Z are like charges, but their identities cannot be determined.
B
Y is negative, and Z is negative.
C
Y and Z are opposite charges, but their identities cannot be determined.
D
Y is negative, and Z is positive.
48

After picking up several staples with the device, what change would enable Tony to drop the staples in the scrap metal bin?

A
removing the battery
B
spreading the wire loops farther apart
C
removing the iron nail
D
moving the wire loops closer together
49

Which describes the image produced by the lens?

A
inverted and larger than the object
B
upright and larger than the object
C
real and smaller than the object
D
real and larger than the object
50

What is the equivalent resistance of the circuit?

A
0.61 Ω
B
18 Ω
C
7.5 Ω
D
1.6 Ω

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N/A — Exam Answers — Physics