Nuclear fission & fusion multiple choice questions

Nuclear Fission & Fusion

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1 of 9

What is the main purpose of a moderator in a thermal nuclear reactor?

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2 of 9

In the core of a nuclear reactor, the mass of fuel decreases at a rate of 9.0 × 10⁻⁶ kg hour⁻¹ due to nuclear reactions.

What is the maximum power output of the reactor?

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3 of 9

A deuterium nucleus and a tritium nucleus fuse together to form a helium nucleus and a particle X. The equation for this process is:

$_{1}^{2} H +_{1}^{3} H \to_{2}^{4} He + X$

What is X?

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4 of 9

What effect are the control rods intended to have on the average kinetic energy and number of fission neutrons in a thermal nuclear reactor?

Table showing the effect of control rods on average kinetic energy and number of fission neutrons in a thermal nuclear reactor.

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5 of 9

During a single fission event of uranium-235 in a nuclear reactor the total mass lost is 0.23 u. The reactor is 25% efficient.

How many events per second are required to generate 900 MW of power?

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6 of 9

Which of the following substances can be used as a moderator in a nuclear reactor?

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7 of 9

The mass of the fuel in a fission reactor decreases at a rate of 6.0 × 10⁻⁶ kg hour⁻¹.

What is the maximum possible power output of the reactor?

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8 of 9

When a nucleus of uranium-238 absorbs a neutron, one combination of fission products can be tin-126 and a nucleus of element X. 13 neutrons are also emitted.

$_{92}^{238} U +_{0}^{1} n \to X +_{50}^{126} Sn + 13_{0}^{1} n$

How many neutrons are there in the nucleus of element X?

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9 of 9

The total energy released in a single fusion reaction is 4.0 MeV.

What is the change in mass in this fusion reaction?

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