Brainscape's Knowledge GenomeTM

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


See full index

Physics CGP (not paper 2) > Section 3 > Flashcards

Section 3 Flashcards

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

What is wavelength?

A

The distance from one peak to the next.

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

What is frequency?

A

How many complete waves there are per second.

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

What is frequency measured in?

A

Hertz (Hz)

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

What is the amplitude?

A

Height of the wave from the rest to crest.

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

What is the period?

A

The time it takes for one complete wave to pass a point.

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

What is the period measured in?

A

Seconds.

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

Examples of transverse wave?

A

Light and all other EM waves.

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

Describe transverse waves.

A

The vibrations are at 90 degrees to the direction energy is transferred by the wave.

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

Example of longitudinal waves?

A

Sound and ultrasound.

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

Describe a longitudinal wave.

A

The vibrations are along the same direction as the wave transfers energy.

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

What does reflected mean?

A

They rebound off the material.

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

What does refracted mean?

A

They go through the new material but change direction.

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

Which has the lowest frequency: radio waves or gamma rays?

A

Radio waves.

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

Which has the longest wave length: radio waves or gamma rays?

A

Radio waves.

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

What 2 things do all EM waves have in common?

A

They are all transverse and all travel at the same speed through a vacuum.

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

What are radio waves mainly used for?

A

Communications.

17
Q

Why can long wave radio be transmitted around the world?

A

Long wavelengths diffract around the curved surface of the earth.

18
Q

Why can short-wave radio signals be received a long distance from the transmitter?

A

They are reflected from the ionosphere.

19
Q

What are microwaves used for?

A

Satellite communication.

20
Q

What else are microwaves used for?

A

Cooking.

21
Q

How do microwaves cook food?

A

The microwaves are absorbed by the water molecules in the food. They penetrate a few centimetres into the food before being absorbed. The energy is then conducted or connected to other parts of the food.

22
Q

What is infrared radiation used in?

A

Heating and to monitor temperature.

23
Q

How does night-vision equipment work?

A

The equipment turns the radiation into an electrical signal, which is displayed on a screen as a picture, allowing things which would otherwise be hidden in the dark to be seen.

24
Q

What is ultraviolet used in?

A

Fluorescent lamps.

25
Q

What do we use X-Rays for?

A

They are used to view the internal structures of objects and materials, including our bodies.

26
Q

What is gamma radiation used for?

A

Sterilising medical equipment and food.

27
Q

What types of radiation are absorbed by the body and cause the heating of cells?

A

Microwaves.

28
Q

What radiation can cause cancerous changes in living cells?

A

Gamma rays

29
Q

Why do microwaves need to have shielding?

A

To prevent microwaves from reaching the user.

30
Q

Why can infrared be dangerous?

A

Too much exposure can cause skin burns.

31
Q

Why is ultraviolet dangerous?

A

It damages surface cells and can cause blindness.

32
Q

How is a virtual image formed?

A

When the light rays bouncing off an object onto a mirror are diverging, so the light from the object appears to be coming from a completely different place.

33
Q

Why does white light disperse into different colours as it enters a prism?

A

Different wavelengths of light refract by different amounts.

34
Q

When entering a triangular block does the light diffract towards or away from the normal?

A

Towards.

35
Q

Sinc =

A

1/n

36
Q

When does total internal reflection occur?

A

When the angle of incidence is greater than the critical angle.

Physics CGP (not paper 2) (7 decks)

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