P7 - Radioactivity Flashcards
1
Q
Three type of radiation
A
Gamma, Beta and Alpha
2
Q
Atomic number is
A
The amount of protons
3
Q
Mass number is
A
Protons and neutron
4
Q
Radioactive decay is where an unstable nucleus
A
Emmits alpha or beta particle or gamma ray
5
Q
Alpha particles are made of
A
Two protons and two neutrons
6
Q
Beta particles is
A
An emitted electron (relative charge of -1)
7
Q
When unstable nucleus emmits beta
A
Atomic number goes up by one
8
Q
Gamma ray is
A
Electromagnetic radiation from at atoms nucleus
9
Q
Gamma emission (charge/mass)
A
It is uncharged and has no mass
10
Q
Ionisation is where radiation can knock
A
Electrons out of atoms
11
Q
Activity of a radioactive source is
A
Number of unstable atoms that decay per second (measured in Becauerel)
12
Q
Half life is the time taken for …
A
The number of nuclei in an isotope to halve
