Radioactivity

Question 1

Who suggested the idea of the plum pudding model of the atom.

Answer 1

J.J Thomson

Question 2

Who did the gold foil experiment in 1909?

Answer 2

Rutherford or Marsden

Question 3

Who tweaked Rutherford’s model of the atom?

Answer 3

Niels Bohr

Question 4

Which sub-atomic molecule are positively charged?

Answer 4

Protons

Question 5

How can electrons go to higher energy levels?

Answer 5

They get excited

Question 6

What is released when electrons move between energy levels?

Answer 6

EM radiation

Question 7

If an atom is ionised…..

Answer 7

it loses an electron

Question 8

Give an example of something that ionises atoms

Answer 8

Nuclear radiation

Question 9

What are isotopes?

Answer 9

Different forms of the same element.

Question 10

What element’s nucleus is emitted during alpha radiation?

Answer 10

Helium

Question 11

What 2 things can Beta particles emit?

Answer 11

Positrons or electrons.

Question 12

What blocks alpha particles?

Answer 12

paper

Question 13

What blocks beta particles

Answer 13

5mm thick aluminium

Question 14

What blocks gamma rays?

Answer 14

Meters of concreate

Question 15

Give the order of the 3 radiation types from most to least ionising.

Answer 15

Alpha, Beta, Gamma

Question 16

What is activity measured in?

Answer 16

Baquerels (Bq)

Question 17

What is half life

Answer 17

The half-life is the average time taken for the number of radioactive nuclei in an isotope to halve.

Question 18

The activity of a sample is 780Bq. 2 hours later, it was 97.5Bq. What is the half life?

Answer 18

40 mins

Question 19

Give 2 sources of background radiation

Answer 19

1) Naturally occurring unstable isotopes