Heat Transfer

Question 0

Conduction

Answer 0

The energy is passed from one vibrating atom to the next

Question 1

What are all metals

Answer 1

Conductors however some are better than others

Question 2

Name given to process of convection

Answer 2

Convection current

Question 3

Convection

Answer 3

Hot liquids and gases expand and rise while the cooler liquids or gases fall

Question 4

What can infra red rays travel through and at what speed

Answer 4

A vacuum at the speed of light

Question 5

Radiation

Answer 5

Energy is transferred by infra-red rays

Question 6

What are poor radiators and absorbers

Answer 6

Shiny silver surfaces

Question 7

What are good absorbers and radiators

Answer 7

Dull black surfaces

Question 8

More energy is radiated

Answer 8

The hotter the object is

Question 9

Conduction is when heat travels through

Answer 9

A solid

Question 10

In conduction heat is passed on by

Answer 10

Vibrations

Question 11

When a solid is hot

Answer 11

It’s vibrations are bigger because it has more energy

Question 12

Heat is carried by

Answer 12

Free electrons

Question 13

Conduction experiments

Answer 13

Thermal conductivity bars
Wire gauze in iced water
Paper on wood and brass

Question 14

How does a convection current work

Answer 14

When a fluid is heated it expands and becomes less dense and so will float above cooler fluids

Question 15

Convection experiments

Answer 15

Potassium magnate in water

Smoke and candle

Question 16

When does an object absorb thermal radiation

Answer 16

When it’s cooler than its surroundings

Question 17

When does an object emit thermal radiation

Answer 17

When it is hotter than its surroundings