I need an explanation for this Physics question to help me study.
Radioactive decay
1
Gamma radiation can be significantly reduced by…
Paper
Aluminium
Lead
2
What form of radiation is emitted by nuclei with too many neutrons?
Alpha
Gamma
Beta
3
Gamma radiation is…
An electromagnetic wave
A helium nucleus
An electron
4
Which form of radiation has the highest ionising power?
Gamma
Alpha
Beta
5
What causes an atom’s nucleus to become unstable?
Too many or too few neutrons in the nucleus
More electrons than protons
Fewer electrons than protons
6
What is the activity of a source that emits 1,200 particles per minute?
1,200 Bq
20 Bq
72,000 Bq
7
Uranium 238 emits an alpha particle to become what nucleus?
Thorium-234
Thorium-239
Thorium-236
8
An alpha particle is…
An electron
A helium nucleus
An electromagnetic wave
9
Which type of radiation can reach the furthest?
Beta
Gamma
Alpha
10
What fraction of a radioisotope has decayed after two half-lives? – Higher
One quarter
All of it
Three quarters
