Physics P1

Question 0

What is the main form of heat transfer in solids ?

Answer 0

Conduction

Question 1

What are the 3 ways heat energy can be transferred ?

Answer 1

Convection
Conduction
Radiation

Question 2

What is the main form of heat transfer in liquid and gasses ?

Answer 2

Convection

Question 3

T or F
Infrared can be emitted by solid
Liquid and gas

Answer 3

True

Question 4

What is inflated radiation ?

Answer 4

Emission of electromagnetic waves - all objects are continually emitting and absorbing infared radiation

Question 5

What is the Main form of heat transfer in solids?

Answer 5

Conduction

Question 6

What is the main form if heat transfer in solid and liquid ?

Answer 6

Convection

Question 7

What sort of objects can both absorb and emit infared radiation ?

Answer 7

Any objects can both absorb and emit infrared radiation whether or not conduction or convection are also taken place

Question 8

the bigger the temperature difference between a body and its surrounding the faster energy is transferred by heating

Answer 8

True

Question 9

How is infrared radiation emitted from objects?

Answer 9

All object emits infared radiation from the surface

Question 10

Learn FACT :

Answer 10

A objects that’s hotter than it’s surrounding admits more radiation than it absorbs -Cool down
And an object at school it didn’t surrounded of little more radiation than it emits- warms up
The hotter an object is more radiation radiates in a given time

Question 11

What factors does Radiation depend on?

Answer 11

Surface Colour and texture

Question 12

Why does radiation depends on the surface:

Answer 12

Dark Matt surfaces absorb infrared radiation falling on them much better thanShiny surfaces than light, shiny surfaces such as gloss white or
Silver. They also admit much more IR at any given tempteture

Question 13

Why is having a dark surface better for radiation

Answer 13

Dark Matt surfaces absorb infrared radiation falling on them much better thanShiny surfaces than light, shiny surfaces such as gloss white or
Silver. They also admit much more IR at any given tempteture

Question 14

Why is light shiny surfaces bad for the absorbtion of radiation?

Answer 14

Like shiny surfaces reflect a lot of infrared radiation

Question 15

Why is the inside of a vaccum flask got a light shiny surface?

Answer 15

Silver inner surfaces to keep heat in or out depending on whether it is storing hot or cold liquid

Question 16

Why does solar hot water panels contain water pipes under a black surface?

Answer 16

The radiation from the sun is absorbed by the black surface heat the water in the pipes this water can be used for washing all pumped to radiators to heat the building

Question 17

What are the three states of matter?

Give examples

Answer 17

Solid
Liquid
gases

Question 18

Describe the positioning and the properties of the particles in a solid

Answer 18

There are strong forces of attraction which holds the particles close together in a fixed regular arrangement of particles have much energy so they can only vibrates about their fixed position

Question 19

Describe the positioning and properties of the particles in a liquid?

Answer 19

There are Weaker forces of attraction between the particles and the particles are close together but can move past each other and form and in regular arrangement -they have more energy than the particles in a solid and they move in randon direction at low speed

Question 20

Describe the properties and positioning of particles and gases

Answer 20

Almost no forces of attraction between the particles to particles have more energy then Those in liquids and solid and they are also free to move and travel in random directions at high speed

Question 21

What is conduction of heat energy

Answer 21

It’s the process when vibrating particles pass on extra kinetic energy to neighbouring particles

Question 22

Why are metals good conductors?

Answer 22

Metal contains free electrons
At the Hot end the electrons move faster and collides with other free electron transferring energy is about electrons then pass on their extra energy to other electrons
Because the electrons can move freely this obviously is a much faster way of transferring energy through the metal then slowly passing it between the neighbouring atom
This is by heat energy travel so fast through metals

Question 23

What type of factors are better at IR?

Answer 23

.Matt dull surface area absorb infrared radiation better than light bright surface area

Question 24

Why is light surface area are bad at absorbing IR?

Answer 24

This is because the light surface area are are better at reflecting eat rather than absorbing

Question 25

What is conduction?

Answer 25

Conduction is in the process of vibrating particles passing on the extra kinetic energy to neighbouring particles

Question 26

What is convection?

Answer 26

energetic particles moves from the hotter region to the colder region and and take heat energy with them

Question 27

What is convection currents?

Answer 27

It's a change in density

Question 28

How does convection current account in a immersion heater?

Answer 28

The particles gain energy from the coils which then leads the liquid to expand and become less dense The particles At the top will get some more energy so start moving around faster As the hot water rises it displaces the cold water out of the way of making it sink towards the heater coils , overall the liquid particles contracts and becomes more dense and sinks Cold water is heated by the coils and rises this is convection current

Question 29

What is condensation?

Answer 29

Condensation is when gas turns into liquid

Question 30

Describe the process in condensation?

Answer 30

When the gas calls the particles slow down and this kinetic energy Attraction forces begins to pull the particles together at daily less kinetic energy Eventually the gas condenses into liquid

Question 31

What is in evaporation?

Answer 31

Is when the liquid turned into gas

Question 32

Describe the process that happens in the evaporation

Answer 32

absorb heat energy okay kinetic energy and travel in randonm direction Some of the particles will esccape from the surface area are leaving the remaining of the liquid to become

Question 33

What factors will affect evaporation?

Answer 33

Big surface area Higher tempteture Wind/draft/fan (increases speed at which particles are made from the surface area so increase rate of evaporation

Question 34

What does u values mean?

Answer 34

U values shows how fast heat can transfer through a material

Question 35

True or faulse | Heat transfer faster through material with higher u value than through materials with low u value

Answer 35

True the better the insulator the Lower the lower uvalue

Question 36

Why type of insulation would you have in your house

Answer 36

``` Cavity wall insulation Loft insulation Draught proofing Hot water tank jacket Thick curtain ```

Question 37

What is specific heat capacity ?

Answer 37

How much energy stuff can be store

Question 38

What are the formula for specific heat capacity ?

Answer 38

E= m x c x 0

Question 39

Name 4 type of energy

Answer 39

Chemical energy Gravitational potential Elastic potential Thermal energy

Question 40

Name the three form of stored energy ?

Answer 40

* gravitational potential * elastic energy * chemical energy

Question 41

What is the conservation of energy principle ?

Answer 41

Energy can be transferred usefully from to another stored or dissipated but never be created or destroyed

Question 42

What do radiators have large surface. Area

Answer 42

This is because they have a large surface area to maximise the amount of heating transfer the bigger the surface the more infrared wave that can be emitted from the surface

Question 43

Why does Cars and motorbike have engine which often has fins?

Answer 43

They increase the surface area say heat is radiated away quick call to the engine cools with quicker

Question 44

Why does people use a 'vaccum' as insulation

Answer 44

Because it stopped all conduction and convection through the side

Question 45

How does insulating foam work?

Answer 45

This minimises heat conduction and convection

Question 46

Why does artic foxes have small ears ?

Answer 46

With a small surface area to minimise heat loss by radiation and conserve body heat

Question 47

What does E = m x c x 0 mean

Answer 47

E= energy transferred in J m= mass in kg C = specific heat capacity 0 tempteture change

Question 48

What is the formula for energy ?

Answer 48

Energy = power X time

Question 49

What are non renewable energy ?

Answer 49

They will eventually run out | They do damage to the enviromental yet provide the most of our energy

Question 50

What are renewable energy ?

Answer 50

They will never run out but don't provide much energy and some of them are unreliable because they depend on the weather

Question 51

What are example of non renewable energy ?

Answer 51

Coal Oil Natural Gas Natural fuel

Question 52

What are examples of renewable resources?

Answer 52

``` Wind Solar Tides Biofuels Geothermal Hydroelectric ```