Heat Radiation

Question 1

Which way does HEAT ENERGY flow?

Answer 1

From a HOTTER object to its COOLER SURROUNDINGS

Question 2

Name the 3 types of ENERGY TRANSFER

Answer 2

RADIATION
CONDUCTION
CONVECTION

Question 3

What is HEAT RADIATION?

Answer 3

It is the transfer of heat energy by infrared (IR) radiation

Question 4

Which type(s) of energy transfer uses particles?

Answer 4

Conduction and convection

Question 5

Which type(s) of energy transfer is/are most common in solids?

Answer 5

Conduction

Question 6

Which type(s) of energy transfer is/are most common in liquids?

Answer 6

Convection

Question 7

Which type(s) of energy transfer is/are most common in gases?

Answer 7

Convection

Question 8

[ ] can be emitted by solids, liquids and gases

Answer 8

Infrared Radiation

Question 9

Any object can both [ ] or [ ] IR radiation whether or not conduction or convection are also taking place

Answer 9

Absorb

Emit

Question 10

The BIGGER the temperature difference between a body and its surroundings…

Answer 10

…the FASTER energy is transferred by heating.

Question 11

What is IR radiation?

Answer 11

The emission of Electromagnetic Waves in the IR spectrum

Question 12

All objects are continually emitting and absorbing [ ]

Answer 12

Infrared Radiation

Question 13

Where is IR radiation emitted from?

Answer 13

The surface of an object

Question 14

An objects that’s HOTTER than its surroundings…[ ]…than it absorbs (as it cools down)

Answer 14

Emits more radiation

Question 15

An objects that’s COOLER than its surroundings…[ ]…than it emits (as it warms up)

Answer 15

Absorbs more radiation

Question 16

The [ ] an object is, the MORE radiation it radiates in a given time

Answer 16

HOTTER

Question 17

Radiation depends on …

Answer 17

… Surface colour and texture.

Question 18

Which surface colour and texture emits and absorbs the most IR radiation?

Answer 18

Black and Matt

Question 19

Which surface colour and texture emits and absorbs the least IR radiation?

Answer 19

Gloss white / Silver and shiny

Question 20

Solar Hot Water Panels contain Water Pipes and are both [ ] , why?

Answer 20

Black
Radiation from the sun is absorbed by the black surface to heat the water in the pipes.
This water can be used for washing or radiators