c4 practise test

Question 1

What does relative atomic mass mean about the abundance of isotopes

Answer 1

isotopes have different abundance, Ram is just a weighted average

Question 2

How is gamma radiation used in cancer treatment

Answer 2

Helps diagnose Gamma rays penetrate from the area to the detector

Question 3

Explain how the fission leads to a chain reaction, and why it must be controlled in a nuclear reactor.

Answer 3

The atom absorbs a neutron, splitting in to smaller nuclei. This releases more electrons which can trigger fission of other atoms continuing the chain.
if uncontrolled explosion could occur,

Question 4

How does radiation from a banana compare to microwave and phone

Answer 4

Banna is beta ionising radiation
Microwave and phone are electromagnetic radiation non ionising

Question 5

how is beta radiation used in cancer treatment

Answer 5

Beta particle is high ionising so able to destroy cancer cells
but low penetration means other healthy tissue is safe

Question 6

Practical use of alpha radiation

Answer 6

smoke detectors
Low penetration allows the radiation to be contained in the smoke alarm
alpha is also highly ionising so it reacts to the smoke quickly