Brainscape's Knowledge GenomeTM

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


See full index

Physics P1 > Heat transfer > Flashcards

Heat transfer Flashcards

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

What are three was heat is transferred?

A

Radiation
Conduction
Convection

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

What is heat radiation?

A

The transfer of heat energy by Infrared radiation

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

What energy transfers, transfer their energy by particles?

A

Conduction

Convection

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

What is the main form of heat transfer in solids?

A

Conduction

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

What is the main form of heat transfer in liquids and solids?

A

Convection

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

What can be emitted by liquids solids and gases?

A

Infrared Radiation

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

What can absorb and emit infrared radiation?

A

Any object, whether or not conduction or convection are taking place

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

The bigger the temperature difference between a body and its surroundings, the….

A

…faster energy is transferred by heating

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

What is infrared radiation? (waves)

A

Emission of electromagnetic waves

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

When do objects absorb and emit IR?

A

Continually

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

Where is IR emitted from?

A

The surface of an object

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

An object that’s hotter than its surrounding emits ….(+/-)…. radiation than it absorbs
What happens to the temperature of the object?

A

More - it cools down

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

An object that’s cooler than its surrounding emits ….(+/-)…. radiation than it absorbs
What happens to the temperature of the object?

A

Less - it warms up

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

The hotter an object is the more….

A

radiation it radiates in a given time

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

What does radiation depend on?

A

Surface colour and texture

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

What absorbs IR better than light shiny surfaces, such as glass or silver?

A

Dark, matt surfaces

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What emit more IR than shiny light surfaces?

A

Dark matt surfaces

18
Q

What do light shiny surfaces do to IR?

A

They reflect a lot of the IR falling on them

19
Q

What uses shiny light surfaces to reflect IR? How?

A

Vacuum flasks have silver inner surfaces to keep heat out or in.

20
Q

Where do solar hot water pipes run?

A

Under the black surface, or painted pipes under glass.

21
Q

How is the water in pipes in solar panels heated?

What can this water be used for?

A

Radiation from the sun is absorbed by the black surface to heat the water
Washing or to be pumped into radiators to heat the building

22
Q

Kinetic theory describes how…
Kinetic theory explains ….
The energy an object (or particle) has because of its movement is called its….

A

… particles move in solids liquids and gases
… the three states of matter
… kinetic energy

23
Q

What are the three states of matter, give examples….

A

Solid - ice
Liquid - water
Gas - water vapour

24
Q

What is the difference between particles of different state?

A

Their arrangement and energy of particles are different

25
Q

Solids:
What forces hold the particles close together in a ….. ….. arrangement?
How much energy do the particles have and what does this mean?

A

Strong forces of attraction, fixed regular arrangement

The particles don’t have much energy so they vibrate in their fixed positions

26
Q

Liquids:
How strong are the forces of attraction between the particles?
How are the particles arranged?
They have …… energy than particles in a solid.
They move in ….. directions at ….. speeds

A

Weaker
They are close together but can move past each other, they are in an irregular arrangement
More
Random…. low

27
Q

Gases:
How much force of attraction is there between the particles?
How much energy do the particles have?
How do the particles move?

A

Almost none
More than liquids and solids
They are free to move and travel in random directions and at high speeds

28
Q

When you heat a substance you give its particles….. they then…
This is what causes solids to …. and liquids to ….

A

More kinetic energy - the vibrate and move faster
Solids to melt
Liquids to boil

29
Q

Conduction of heat occurs in what state of particles? (s.l,g)

A

Mainly in solids

30
Q

What is the process where vibrating particles pass on their extra kinetic energy to neighboring particles

A

Conduction

31
Q

Conduction continues throughout the solid and gradually some ….. is passed all the way through the solid causing a ….. at the end of the solid.
This causes an …. in the heat …. from its surface.

A

extra kinetic energy…. increase in temperature.

Increase… radiating

32
Q

Conduction is usually faster in what type of solid?

Why? (collide)

A

Denser solids

Because the particles are closer together and so will collide more often and pass energy between them

33
Q

Materials that have larger spaces between their particles conduct….
these are called ….

A

….heat energy much more slowly

Insulators

34
Q

Why are materials good conductors? why are metals so good at conducting?

A

Because of their free electrons, these are free to move inside the metal.

35
Q

How does conduction happen through a metal heated at one end?
So why does conduction happen faster in a metal than another material?

A

At the hot end electrons move faster and collide with the free electrons, transferring energy, these pass on their energy to the next electron.
Electrons transfer energy faster as they are free to move when atoms vibrating and passing their energy is slower

36
Q

When does convection occur in gases and liquids?

Why doesn’t it occur in solids?

A

When the particles with more energy move from the hotter region to the cooler region and take their energy with them
Because the particles aren’t free to move about.

37
Q

How to immersion kettles and hot water tanks work?

A

By convection currents

38
Q

Describe how an immersion heater works:

  1. The coils and water:
  2. Particles near the coils…..
  3. So the water becomes … …. because….
  4. What happens to the hot water?
  5. So the cold water is …
  6. So the cold water now gets….
A
  1. Heat energy is transferred through radiation from the coils to the water
  2. get more energy so move around faster
  3. less dense, because there is more space between the particles so it expands
  4. It’s less dense so it rises above the cool water
  5. Displaced as the hot water takes its place so it sinks down to the coil
  6. heated by the coils and rises so you get convection currents circling the heat energy through the water.
39
Q

Where are convection currents most effective?

A

In round containers, squarish in size as tall thin ones don’t allow good convection, the water can rise but an’t sink.

40
Q

Convection currents are all about …..

A

changes in density

41
Q

What inside object uses convection currents? Why?

A

Radiators, the hot air the water has heated rises in the room as it’s less dense so the cool dense air must sink to fall back to the radiator to heat up.

Physics P1 (4 decks)

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