Brainscape's Knowledge GenomeTM

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


See full index

Nat 5 Physics > Waves And Radiation > Flashcards

Waves And Radiation Flashcards

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

Longitudinal waves

A

Sound

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

Definition of ultrasound

A

Frequencies above 20000Hz

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

Definition of diffraction

A

The bending effect of a wave when obstacles are placed in its way

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

Radio waves

A

Low frequency

Long wavelength

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

Gamma ray

A

High frequency

Short wavelengths

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

What can radio waves do?

A

Diffract easily

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

What are microwaves used for

A

Send signals up to space

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

Example of transverse waves

A

Light

Water

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

What is infrared used for

A

Speeds up the healing of muscle tissue

Thermal imaging cameras

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

What is visible light used for

A

Lasers

Remove birthmarks and tattoos

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

What is ultraviolet used for

A

Treating skin conditions like acne

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

What are gamma rays used for

A

Killing cancer cells

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

What is refraction

A

The process where the speed of a wave changes as it travels from one medium to a different medium

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

What is an alpha particle

A

2 protons and 2 neutrons

Helium nucleus

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

Beta

A

A fast moving electron

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

Gamma

A

An electromagnetic wave

17
Q

What is alpha radiation used for

A

Smoke detectors

18
Q

What is background radiation

A

The radiation that is around us all the time

19
Q

What is Activity

A

Number of decays each second

20
Q

What are some safety precautions when dealing with radiation

A

Limit the time exposed to radiation
Put a distance between yourself and the radioactive source
Use tongs to lift the source
Never bring radioactive sources close to your bode
Store in lead lined box
Wash hands afterwards

21
Q

What is meant by the term half life

A

The time taken for the activity of a radioactive source to half its previous value

22
Q

What is fission

A

When a neutron is fired at a large unstable uranium nucleus which absorbs the neutron and then splits into two smaller nuclei and then causes a chain reaction

23
Q

What is fusion

A

When two smaller nuclei fuse together to form a large nucleus

24
Q

Advantages of nuclear fission

A

No greenhouse gases
Stable supply of electricity
Uses a small amount of fuel but creates a large amount of electricity

25
Q

Disadvantages of nuclear fission

A

Produces nuclear waste that is dangerous for hundreds of years
Expensive to store nuclear waste
Catastrophic events like earthquakes and tsunamis could cause dangerous radiation emissions
Nuclear power station are expensive to build

26
Q

Advantages of fusion

A

No greenhouse gases
No radioactive waste
Hydrogen as a fuel which is easy to source as it is in water

27
Q

Disadvantages of fusion

A

Requires temperatures close to the sun to work which is very dangerous

Nat 5 Physics (4 decks)

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