P1.1 Energy Transfer By Heating

Question 0

______ objects give off more infrared radiation.

Answer 0

Hotter

Question 1

What is infrared radiation emitted by?

Answer 1

All objects

Question 2

How does temperature effect how infrared radiation is emitted?

Answer 2

The hotter the object the more infrared radiation it emits.

Question 3

Why is a vacuum?

Answer 3

???

Question 4

How is infrared radiation transferred?

Answer 4

By all electromagnetic waves

Question 5

What type of surface is the best at absorbing and emitting infrared radiation?

Answer 5

Dark, Matt surfaces absorb the most infrared.

Question 6

What surfaces are the best reflectors of infrared?

Answer 6

Light shiny surfaces

Question 7

Why are the three states of matter?

Answer 7

Solid, liquid and gas

Question 8

How are the particles in a solid arranged?

Answer 8

They are held next to each other, vibrating in their fixed positions

Question 9

How are the particles in liquids arranged?

Answer 9

They move about randomly and at in contact with each other

Question 10

How are the particles in a gas arranged?

Answer 10

They move are puns randomly and are far apart

Question 11

What state of matter does conduction take place in?

Answer 11

Mainly solids. Liquids and gases are poor conductors

Question 12

What happens when a solid is heated?

Answer 12

The particles gain kinetic energy and vibrate more, transferring the energy through the solid

Question 13

What is an insulator?

Answer 13

A poor conductor.

Question 14

Why are materials that trap air good insulators?

Answer 14

Because air is a poor conductor.

Question 15

What is a fluid?

Answer 15

A liquid or a gas.

Question 16

Define convection.

Answer 16

The circulation of a liquid or gas cause by heating it.

Question 17

What happens when you heat a liquid or gas?

Answer 17

Heating a liquid or gas makes it expand, therefore becoming less dense so it rises and causes circulation.

Question 18

Why doesn’t convection occur in solids?

Answer 18

Because the particles are held in fixed positions an are my able to flow

Question 19

What is evaporation?

Answer 19

When a liquid turns into a gas

Question 20

What is condensation?

Answer 20

When a gas turns into a liquid

Question 21

Give two factors that effect the rate of evaporation.

Answer 21

Surface area

Temperature

Question 22

Give two factors that effect the rate of condensation.

Answer 22

Surface area

Surface temperature

Question 24

Give three factors that effect the rate of energy transfer.

Answer 24

Temperature difference
Shape
Surface area

Question 25

Why does trapping air in small pockets minimise air transfer?

Answer 25

because convection currents can not be set up.

Question 26

give three ways of minimising energy transfer out of a house.

Answer 26

-Fibreglass loft insulation
-double glazing
draught proofing
-cavity wall insulation

Question 27

What does the U-value tell us?

Answer 27

how much energy per second passes through a material

Question 28

What is an advantage of solar heat panels?

Answer 28

They don’t use fuel to heat water

Question 29

why is fibreglass a good insulator?

Answer 29

It contains trapped air