Brainscape's Knowledge GenomeTM

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


See full index

Physics > Energy 1 > Flashcards

Energy 1 Flashcards

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

What 3 ways is heat energy transferred?

A

Radiation, Conduction or Convestion

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

How is heat radiation transferred?

A

It is transferred by INFARED (IR) RADIATION

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

How is conduction and convection heat transferred?

A

It is transferred of energy by PARTICLES

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

How is heat transferred in solids?

A

By CONDUCTION

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

How is heat transferred in liquids and gases?

A

By CONVECTION

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

Can solids, liquids or gases emit infared radiation?

A

All three can emit infared radiation

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

Can any object be absorb and emit infrared radiation?

A

Yes ANY object can both absorb and emit infrared radiation whether or not CONDUCTION or CONVECTION is 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 faster ……….?

A

……… energy is transferred by heating

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

All objects are continually emitting and absorbing…….?

A

……infrared radiation.

Infrared radiation is emitted from the surface of an object.

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

An object that’s hotter than its surroundings emits…..?

A

……more radiation than it absorbs (as it cools down).

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

An object that’s cooler than its surroundings absorbs ….?

A

……..more radiation than it emits (as it warms up)

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

The hotter an object is, the more radiation……..?

A

….it radiates in a given time.

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

What colour surfaces absorb infrared radiation the best?

A

Dark, matt surfaces are much better at absorbing infrared radiation than gloss white or silver surfaces.

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

What colour surface emits more infrared radiation at any given temperature?

A

Dark, matt coloured surfaces.

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

What colour surface reflect a lot of the infrared radiation the best?

A

Light shiny surfaces REFLECT a lot of the infrared radiation fallen on them.

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

Give an example of how you could use a light shiny surface to reflect infrared radiation.

A

A vacuum flask which will have an inner silver surface.

17
Q

Give an example of how you could use a dark matt surface to absorb infrared radiation

A

A solar hot water panel contains water pipes under a black surface so that it ABSORB more heat thereby heating the water from radiation from the sun.

18
Q

What is kinetic theory is simple terms?

A

It describes how particles move in solids, liquids and gases

19
Q

What are the three states of matter?

A

Solid, liquid or gas

20
Q

Explain kinetic theory in relation to solids.

A

Solids have STONG FORCES of ATTRACTION which hold the particles CLOSE TOGETHER in a FIXED REGULAR arrangement.

The parcels don’t have much energy so they can only VIBRATE about their FIXED positions.

21
Q

Explain kinetic theory in relation to liquids?

A

Liquids have WEAKER FORCES of attraction between the particles. The particles are CLOSE TOGETHER but can MOVE PAST EACH OTHER, and form IRREGULAR arrangements.

They have MORE ENERGY than particles in a SOLID. They move in RANDOM DIRECTIONS at LOW SPEEDS.

22
Q

Explain kinetic theory in relation to gases?

A

Gases have ALMOST NO forces of attraction between the particles. The particles have MORE ENERGY than those in liquids or solids - they are FREE TO MOVE and travel in RANDOM DIRECTIONS at HIGH SPEEDS

23
Q

What happens when you heat a substance in relation to kinetic energy?

A

Heating a substance gives its particles MORE KINETIC ENERGY (KE) - they vibrate or move faster.

This is what eventually causes solids to melt and liquids to boil

24
Q

Conduction of heat occurs in solid, liquid or gas?

A

Conduction of heat usually occurs in solids

25
Q

Describe the process of conduction by heat energy?

A

Conduction of Heat Energy is the process where VIBRATING PARTICLES pass on their EXTRA KINETIC ENERGY to NEIGHBOURING PARTICLES.

Eventually the EXTRA KINETIC ENERGY passes all the way through the solid causing a rip in temperature at the side of the solid.

26
Q

How does the density of a solid affect conduction of heat?

A

The denser the solid the faster conduction takes place because the particles are closer together and so will collide more often and pass energy though them.

27
Q

How does an insulator work in relation to conduction?

A

An insulator has LARGER SPACES between their particles so conducting heat energy is MUCH SLOWER.

28
Q

Why are metals good conductors?

A
  1. The electrons in metals are free to move inside the metal.
  2. At the HOT END the electrons move faster and collide with other FREE ELECTRONS, TRANSFERRING ENERGY.
  3. Because the electrons move FREELY this is a faster way of transferring the energy which is why heat travels so FAST through METALS
29
Q

Which is a is a more efficient conductor: a short fat rod or a long thin rod?

A

A short fat rod because the electrons have less distance to travel (i.e. shorter distance to transfer energy).

Physics (5 decks)

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