Radiation

Question 1

Alpha particles
Composition
Penetrating power
Source
Use

Answer 1

2 protons+2 neutrons
Few Cm of air
Americium 241
Smoke alarm

Question 2

Beta particles
Composition
Penetrating power
Source
Use

Answer 2

High energy electrons from nucleus
5mm Al
Carbon 14
Carbon dating

Question 3

Gamma rays
Composition 
Penetrating power
Source
Use

Answer 3

Electromagnetic radiation
Few Cm lead
Cobalt 60
Killing tumours

Question 4

Alpha particle emission

Answer 4

Mass number -4
Atomic number -2

241 237 4
Americium-> Np+ He
95 93 2

Question 5

Beta particle emission

Answer 5

Atomic number +1
Mass number stays the same

14 14 0
C-> N+ e
6 7 -1

Question 6

Half life

Answer 6

This is the time taken for half of the nuclei in any given sample to decay

Question 7

Uses of radioactivity

3 reasons

Answer 7

Archaeological-carbon dating
Medical-killing tumours
Food irradiation-increase shelf life

Question 8

Radioactivity

Answer 8

The spontaneous breaking up of an unstable nucleus with the emission of one or more types of radiation