Chapter 8.2

Question 1

Conduction

Answer 1

The transfer of heat energy through particles colliding with each other or particles stretching the bonds between them

Question 2

Convection

Answer 2

A method of energy transfer that applies mainly to fluids

Question 3

Convection current

Answer 3

A process where hot air expands and rises, and cold air takes the place of that hot air

Question 4

Stefan-Boltzmann Law definition and formula

Answer 4

The power radiated by a body depends on its surface area A and the absolute temperature of the surface T
P = eσAT^4
σ = 5.67 x 10^(-8)
e = emissivity

Question 5

Emissivity

Answer 5

A measure of how effectively a body radiates

Question 6

Black body

Answer 6

An object with an emissivity of 1

Question 7

Wien’s displacement law

Answer 7

Most of the electromagnetic energy radiated by a body is radiated at a specific wavelength determined by the temperature of the body
(Wavelength)T = 2.90 x 10^(-3)

Question 8

Solar constant

Answer 8

The intensity of solar radiation at the top of Earth’s atmosphere, 1400 Wm^(-2)

Question 9

Albedo

Answer 9

The ratio of the power of radiation scattered from the body to the total power incident on the body

Question 10

Greenhouse gases

Answer 10

Gases in the atmosphere that absorb infrared radiation, consisting of water vapor, carbon dioxide, methane and nitrous oxide

Question 11

Greenhouse effect

Answer 11

The warming of the Earth caused by infrared radiation, emitted by the Earth’s surface, which is absorbed by various gases in the Earth’s atmosphere and is then partly re-radiated towards the surface