Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

physics > radioactivity > Flashcards

radioactivity Flashcards

You may prefer our related Brainscape-certified flashcards:
AP® Physics flashcards Physics 101 flashcards
1
Q

what is the basic structure of an atom

A

a postively charged nucleus composed of protons and neutrons surrounded by negatively charged electrons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

where is most of the mass of an atom concentrated

A

nucleus

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

how can the electron arrangements of the nucleus change

A

the absorption of the electromagnetic radiation that causes electrons to move further from the nucleus, the emission of electromagnetic radiation causes electrons to move closer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what is the mass number

A

the number of protons and neutrons in an atom

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

why do atoms have no overall charge

A

the number of electrons is equal to the number of protons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what is atomic number

A

thr number of protons in tje nucleus

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

what is the radius of an atom

A

0.1nm or 0.1x10to the power of-3m

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

what is the radius of a nucleus

A

1x10 to the power of-14m

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

what is the mass of protons and neutrons

A

1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what is the mass of electrons

A

negligible

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

what are isotopes

A

atoms of the same element with diffefent numbers of neutrons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

how do atoms form positive ions

A

they lose one or more electrons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

what model of the atom was developed following the discovery of the electron

A

plum pudding model

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

describe the plum pudding model of the atom

A

ball of positive. harge with negative electrons embedded in it

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

what was concluded from the alpha particle scattering experiment

A

the mass of the atom was concentrated at the centre and the nucleus was charged

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

what model replaced the plum pudding model

A

nuclear model

17
Q

how did neils bohr adapt the nuclear model

A

he suggested that electrons orbit the nucleus at specific distances

18
Q

what did the experimental work of james chadwick prove

A

the existancw of neutrons in the nucleus

19
Q

what is radioactive decay

A

the random process by which the nucleus gives out radiation to become stable

20
Q

what is activity

A

the rate at which a source of unstable nuclei decay

21
Q

what is the unit for activity

A

becquerel, Bq

22
Q

what is count rate

A

the number of decays recorded each second by a detector

23
Q

what is an alpha particle

A

a helium nucleus which is two neutrons and two protons

24
Q

what is a beta particle

A

a high speed electron ejected from the nucleus as a neutron turns into a proton

25
Q

what is a gamma ray

A

electromagnetic radiation from the nucleus

26
Q

what is half life

A

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

27
Q

what is contamination

A

tje unwanted prescence of materials containing radioactive atoms on other materials

28
Q

what is irradiation

A

the process of exposing an object to nuclear radiation, the irradiated object does not become radioactive

physics (11 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions