physics

Question 1

The 2 units of activity

Answer 1

joules

Becquerel

Question 2

what happens to a nucleus that is decaying by neutron emission

Answer 2

mass number stays the same

Question 3

impossible to predict the amount of ______. It is possible to predict the _______ of a very large number of nuclei after a given amount of time using _____

Answer 3

decay, activity, half life

Question 4

what happens to the mass and charge of the nucleus that emits gamma radiation?

Answer 4

nothing happens, its a wave

Question 5

Gamma emitting particles are injected into patients’ bloodstream and detected, why use gamma rays?

Answer 5

Gamma rays are used as it has high penetration but weak ionisation

Question 6

Man made sources of radiation, 4 of them

Answer 6

Xray
fallout from nuclear weapons testing
the fallout from nuclear testing
nuclear power

Question 7

Natural sources of radiation, 4 of them

Answer 7

rocks
animals
plants
gamma rays

Question 8

an instrument used to test for radiation

Answer 8

Geiger muller tube

or cloud chamber

Question 9

two factors that can affect the levels of a background radiation test

Answer 9

• how close you are to the atom

- altitude or latitude

Question 10

why does a student that lives near plenty of houses not have to be worried about background radiation?

Answer 10

there are no nuclear power stations nearby

Question 11

radioactive decay is a ________

Answer 11

systematic process

Question 12

Alpha radiation =

Answer 12

helium nuclei

Question 13

Beta radiation =

Answer 13

high energy electrons

Question 14

Gamma radiation =

Answer 14

electromagnetic waves

Question 15

Alpha radiations range, power, and penetration

Answer 15

3.5cm in air, strongest ionising, low penetration

Question 16

Beta, range, power, penetration

Answer 16

15cm in air, medium ionising, medium penetration

Question 17

Gamma, range power penetration

Answer 17

longest range weakest ionising strongest penetration

Question 18

Half-life meaning

Answer 18

Half the radioactive atoms decay

Question 19

irradation

Answer 19

extract 1

Question 20

contamination

Answer 20

extract 2

Question 21

what can exposure to ionizing radiation lead to

Answer 21

can lead to tumors, cancers and the blood cells becoming ionised

Question 22

protection for radation

Answer 22

gloves and a protective suit

Question 23

the half-life of this radioactive isotope?

Answer 23

2

Question 24

how rutherfords experiments disproved the plum model

Answer 24

rutherford shot a beam of alpha particles at a thin sheet of gold foil, he found that most went through meaning there is empty space, however, some were deflected meaning there is a positively charged nucleus.

This disproves the plum pudding model as its a ball of positive charge dotted with negative charge.

Question 25

rutherfords experiment and how it changed the current atom model

Answer 25

a quick recap of rutherfords experiment:
he fired a beam of alpha particles at a thin sheet of gold foil, most went through meaning there is empty space, however, some were deflected, meaning there is a positively charged nucleus

lead to the current atom model consisting of a positive nucleus