C25 Radioactivity Flashcards
1
Q
Why is radiation called ‘ionising’?
A
Radiation is called ionising because they can ionise atoms by removing electrons, leaving positive ions.
2
Q
How does a Cloud Chamber work?
A
- It contains saturated air with vapour at a very low temperature.
- When air molecules are ionises the liquid condenses onto the ions to leave tracks of droplets to mark the path of the radiation.
3
Q
What does a Cloud Chamber do?
A
It is used to detect the presence of the different types of radiation.
4
Q
Alpha Radiation: Structure, charge
A
- Consists of two protons and two neutrons (helium nucleus)
- Charge 2e+
5
Q
Beta Radiation: Structure, charge
A
- Fast moving electrons B-, or fast moving positrons B+.
- Charge can be e+ or e-, based on whether it’s beta+ or beta- particles.
6
Q
A
