P4:atomic structures

Question 1

what is gamma radiation

Answer 1

high energy electromagnetic waves that are emitted by a unstable nuclei

Question 2

for an alpha equation what do you take away the top and bottom number by

Answer 2

4 and 2

Question 3

what is alpha radiation

Answer 3

when the nucleus ejects a helium nucleus

Question 4

what is beta radiation

Answer 4

when the nucleus decays into a proton and emit high energy electron

Question 5

which radiation is the most ionising

Answer 5

alpha

Question 6

which radiation is the least ionising

Answer 6

gamma

Question 7

which radiation is the most penetrating

Answer 7

gamma

Question 8

which radiation is the least penetrating

Answer 8

alpha

Question 9

what is half life

Answer 9

the time it takes for an activity to half

Question 10

what is radiation

Answer 10

any particle or ray that is emitted by something

Question 11

what happens to unstable nuclei

Answer 11

will decay to become more stable which caues radiation to be emitted
this can ionise other atoms

Question 12

what is alpha radiation used for

Answer 12

smoke detectors

Question 13

what is beta radiation used for

Answer 13

thickness gauge

Question 14

what is gamma radiation used for

Answer 14

radiotherapy
sterilisation

Question 15

what is radioacticity

Answer 15

the rate of decay in a sample of radioactive material

Question 16

What is the unit for activity

Answer 16

Bq(becquerel)

Question 17

what is the half life of an radioactive isotope

Answer 17

the time it takes for the number of nuclei of the isotope in a sample to halve

Question 18

what is half life in terms of count rate/activity

Answer 18

time it takes for count rate of a sample to halve

Question 19

what is count rate

Answer 19

the number of decays per second recorded by a detector (gigamole tube)