Topic 3- radioactivity and ionising radia

Question 1

know the properties of

Answer 1

alpha, beta and gamma

Question 2

positron radiation is

Answer 2

positively charged beta radiation

Question 3

the positron is the antiparticle of

Answer 3

an electron

Question 4

neutron radiation is

Answer 4

neutrons

Question 5

unlike a b and g radiation, neutron radiation

Answer 5

doesn’t directly ionise, but can be absorbed by the nuclei of atoms in the substances they pass through

Question 6

neutrons are absorbed best by

Answer 6

light nuclei

Question 7

neutron absorption often leads to

Answer 7

gamma radiation emission

Question 8

an isotope that lies above the curve had

Answer 8

too many neutrons

Question 9

an isotope that lies below the curve has

Answer 9

too few neutrons

Question 10

Beta- minus decay is the

Answer 10

emission of an electron from the nucleus

Question 11

beta decay happens in isotopes that are neuron

Answer 11

rich

Question 12

in beta decay,

Answer 12

the proton number increases by one, and the nucleon mass number stays the same

Question 13

beta plus decay happens when

Answer 13

there are too few neutrons

Question 14

in beta plus decay a proton gets changed into a neutron

Answer 14

a neutron

Question 15

in beta plus decay

Answer 15

proton number decreases by one, nucleon number stays the same

Question 16

alpha decay happens in very heavy atoms

Answer 16

proton number decreases by two, nucleon number decreases by four

Question 17

gamma radiation is emitted from nuclei with

Answer 17

too much energy

Question 18

gamma radiation is never

Answer 18

alone, always with a or b decay

Question 19

up quarks have relative charge;……….. mass;

Answer 19

2/3 and 1/3

Question 20

down quarks have relative charge;………… mass;

Answer 20

-1/3 and 1/3

Question 21

neutron is made of

Answer 21

2 downs, one up

Question 22

proton is made of

Answer 22

two up one down

Question 23

neutron—> proton

Answer 23

makes beta decay emission

Question 24

proton—> neutron

Answer 24

makes beta plus decay emission

Question 25

isotope with short half life are used as

Answer 25

tracers in medicine

Question 26

PET scanning can help

Answer 26

diagnose illnesses

Question 27

radiation can cause

Answer 27

tissue damage and cell mutations

Question 28

radiation can be used

Answer 28

internally or externally to treat tumours

Question 29

using radiation in medical physics raises

Answer 29

social and ethical issues

Question 30

developing medical techniques can be

Answer 30

controversial (animal testing)