fission and fusion

Which of the following statements is a correct description of the binding energy of a nucleus?

• The energy released when the nucleus forms from individual nucleons.

• The energy released when radiation is emitted from the nucleus.

• The energy required to overcome the force between nuclei.

• The energy required to remove a nucleon from the nucleus

The graph shows how the binding energy (B.E.) per nucleon varies with nucleon

number A for low mass nuclei.

Which of the following is the energy required to split a He‑4 nucleus into 2 protons and

2 neutrons?

• 2.6 MeV

• 7.1 MeV

• 14.2 MeV

• 28.4 MeV

In the decay of Co-60 to Ni-60, the mass decreases from 59.934 u to 59.931 u.

Which of the following expressions gives the energy, in joules, released in the decay?

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The graph shows how the binding energy per nucleon depends upon nucleon number for a range of naturally occurring nuclides.

Which of the following can be deduced from the graph?

• The binding energy for

  120 Sn 50 is greater than it is for 238 U 92

• A nucleus of

  16 O 8 is more stable than a nucleus of

  120 Sn 50.

• Fusion of 2 H 1 with a proton to form 3 He 2 will release energy.

• 238 U 92 can release energy by spontaneous fission.

The graph shows how the binding energy per nucleon depends upon nucleon number for a range of naturally occurring nuclides.

Which of the following can be deduced from the graph?

• 56Fe readily undergoes fission.

• Fission releases less energy than fusion.

• High mass nuclei cannot undergo fusion.

• Low mass nuclei release energy during fusion.

Which of the following statements about nuclear fission is correct?

• A uranium-235 nucleus can only undergo fission after absorbing a proton.

• Kinetic energy is conserved during fission.

• Linear momentum is not conserved during fission.

• The fission fragments have a total mass less than that of the nucleus just

  before fission.

The total number of free neutrons immediately after a fission reaction

• goes down.

• goes up.

• may increase or decrease.

• must stay constant.

Fission and fusion are both nuclear processes.

Which of the following statements is correct for both processes?

• Neutrons are released.

• No harmful radiation is produced.

• The binding energy per nucleon increases.

• The total mass increases.

The fuel used in a nuclear fission reactor is uranium.

Which of the following is required for fission to proceed?

• Neutrons must be removed from the reactor core.

• The reactor core must be very hot.

• The uranium nuclei must absorb neutrons.

• The uranium nuclei must absorb protons

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