Heat Radiation

Question 0

2) Heat can be transferred and radiated in the form of…?

Answer 0

Infrared waves

Question 1

1) How do we get heat from the sun?

Answer 1

Via radiation

Question 2

3) What are infrared waves?

Answer 2

They are electromagnetic waves that travel in straight lines at the speed of light

Question 3

4) Radiation does not need a ….. to travel through?

Answer 3

Median (it can also occur in a vacuum)

Question 4

5) Radiation can only occur through transparent substances like…?

Answer 4

Air, glass and water

Question 5

6) The amount of radiation emitted or absorbed depends on…?

Answer 5

It’s surface, colour and texture

Question 6

7) All objects are continually emitting and absorbing…?

Answer 6

Heat radiation

Question 7

8) The hotter am object becomes the more…?

Answer 7

Heat radiation it emits

Question 8

9) Cooler objects will absorb…?

Answer 8

Heat radiation emitted by hotter objects to increase the temperature of that object

Question 9

10) Matt black surfaces are…?

Answer 9

Very good absorbers and emitters of radiation

Question 10

11) Light coloured, smooth and shiny objects are…?

Answer 10

Very poor absorbers and emitters of radiation

Question 11

12) Grills and toasters heat food by…?

Answer 11

Infrared radiation

Question 12

13) Heat radiated by a grill is absorbed by…?

Answer 12

The surface particles of the food

Question 13

14) Surface particles on food with an increasing kinetic energy, heat more central parts of the food via…?

Answer 13

Conduction or convection

Question 14

15) Microwave ovens use ….. to cook food?

Answer 14

Radiation

Question 15

16) Microwaves penetrate the outer layer of food (about 1cm) are absorbed by…?

Answer 15

Water or fat molecules (increasing there kinetic energy)