9-1 Topic 6 Radioactivity
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» 9-1 Topic 6 Radioactivity
Which one of these statements about alpha radiation is correct?
Alpha radiation has no charge.
Alpha radiation is very ionising.
Alpha radiation travels very far in air.
Alpha radiation is an electromagnetic wave.
When an atom emits an alpha particle its nucleus changes. Which describes the changes in the nucleus?
Proton number decreases by 2. Mass number decreases by 4.
Proton number increases by 2. Mass number decreases by 4.
Proton number decreases by 2. Mass number increases by 4.
Proton number increases by 2. Mass number increases by 4.
The three particles shown are:
A = proton, B = electron, C = neutron
A = neutron, B = electron, C = proton
A = neutron, B = neutron, C = electron
A = electron, B = neutron, C = proton
The size of the charge on an electron is:
a third of the charge on the proton
half the charge on the proton
the same as the charge on the proton
twice the charge on the proton
The atomic number of a neutral atom is always the same as the number of
electrons and neutrons
protons and neutrons
The diagram shows the stability curve for nuclear isotopes. An isotope above the curve will undergo β− decay because it has:
too few protons
too many protons
too few neutrons
too many neutrons
Which statement is correct for β+ and β− particles?
a β+ is positively charged and a β− is negatively charged
the mass of a β+ is 1800 times the mass of a β−
the charge on a β+ is twice the charge on a β−
a β+ is a proton and a β− is an electron
Beryllium-9 has an atomic number of 4 and a mass number of 9. A nucleus of this isotope can be described using this symbol. The number of neutrons in this nucleus is:
The nucleus of a hydrogen atom can be represented by this symbol. The symbol shows that the nucleus consists of
1 proton and 1 neutron
1 proton only
1 neutron only
1 neutron and 1 electron.
Nuclear Fusion. High temperatures and pressures are needed in a nuclear fusion reactor. This is to overcome
the kinetic energy of nuclei
the electrostatic repulsion of protons
the magnetic repulsion of neutrons
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