Particle and Nuclear Physics III

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• D

A nucleus X is radioactive and decays into a nucleus Y.

X and Y are isotopes of the same element. Which combination of particles could have been emitted during the decay process?

A positively charged meson consists of a quark and an antiquark. What could be the quark and antiquark?

• charm and antiup

• down and antitop

• strange and antibottom

• up and antistrange

The figure shows part of a chart of nuclides where neutron number is plotted against proton

number. An unstable nuclide X decays by emitting an α-particle. Which nuclide is formed by the decay of nuclide X?

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• B

• C

• D

The nuclei of common isotopes of hydrogen, helium, lithium and beryllium are shown. Which nucleus contains equal numbers of up and down quarks?