Radioactivity

Question 1

what are the three types of sub-atomic particles?

Answer 1

proton, electrons, neutrons

Question 2

what are nucleons?

Answer 2

protons/ neutrons (subatomic particles in nucleus)

Question 3

relative mass of proton

Answer 3

1

Question 4

relative mass of electron

Answer 4

1/1860

Question 5

relative mass of neutron

Answer 5

1

Question 6

relative charge of proton

Answer 6

+1

Question 7

relative charge of electron

Answer 7

• 1

Question 8

relative charge of neutron

Answer 8

0

Question 9

what happens when an atom loses or gains an electron?

Answer 9

it becomes an ion

Question 10

what are isotopes?

Answer 10

atoms with same number of protons but different number of neutrons

Question 11

what are radioisotopes ?

Answer 11

isotopes with unstable nucleus which have same number protons but different number of neutrons

Question 12

what is ionising radiation?

Answer 12

radiation which has the ability to change the nunmber of electrons of any atoms it hits

Question 13

unit of radioactivity

Answer 13

bequerels, Bq

Question 14

1 Bq =

Answer 14

1 radiation emitted per second

Question 15

methods of detecting radiation

Answer 15

geiger counter
photographic film
cloud chamber

Question 16

how does a geiger counter detect radiation?

Answer 16

produces a small electric current when radiation ionises it

Question 17

how does photograhic film detect radiation?

Answer 17

radiation develops the film

Question 18

how does a cloud chamber detect radiation?

Answer 18

radiation leaves behind trails of vapour which condense into liquid alcohol

Question 19

uses of radioactivity

Answer 19

medical traacer
industrial tracer
radiotherapy
dating