D - Nuclear

Question 1

Who discovered the nucleus?

Answer 1

Rutherford (gold foil experiment)

Question 2

Why are some atoms radioactive?

Answer 2

1. protons and neutrons are imblanaced
2. which makes it unstable
3. when it starts emitting sub-nuclear particles (alpha / beta)

Question 3

Alpha radiation

1. stopped by
2. penetration
3. ionization

Answer 3

1. stopped by air or paper
2. weak penetration
3. very ionizing

Question 4

Beta Radiation

1. stopped by
2. penetration
3. ionization

Answer 4

1. stopped by a meter of air or foil
2. foil
3. low ionization

Question 5

Gamma

1. stopped by
2. penetration
3. ionization

Answer 5

1. 1km of air or lead / concrete
2. lead / concrete
3. very low