Checking Understanding Particle Physics

• A

• B

• C

• D

Which combination of up (u) and down (d) quarks forms a proton?

• uuu

• uud

• udd

• ddd

Which two nuclei contain the same number of neutrons?

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A slow-moving neutron collides with a nucleus of uranium-235. This result in a nuclear reaction that is represented by the following nuclear equation.

where x represents one or more particles.

What does x represent?

• one neutron

• two electrons

• two neutrons

• two protons

A nucleus of magnesium-23 undergoes β+ decay, as represented by the nuclear equation shown.

What is nucleus X?

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What remains constant during β-emission from a number of identical nuclei in a substance?

• proton number of the nuclei

• nucleon number of the nuclei

• neutron number of the nuclei

• energy of the β-particles

Which row gives the correct classification of protons, electrons, and neutrinos?

• A

• B

• C

• D

The grid shows a number of nuclides arranged according to the number of protons and the number of neutrons in each.

A nucleus of the nuclide ⁸Li₃ decays by emitting a β-particle.

(see image)

What is the resulting nuclide?

• A

• B

• C

• D

When a nucleus of ²³⁸U₉₂ absorbs a slow neutron it subsequently emits two β-particles.

What is the resulting nucleus?

• ²⁴⁰Np₉₃

• ²⁴⁰Pa₉₁

• ²³⁹Pu₉₄

• ²³⁹Th₉₀