Theme B - B.2 - Greenhouse Effect

Question 1

No object is a perfect _ _.

Answer 1

black body

Question 2

What is emissivity?

Answer 2

The ratio of power emitted per unit area by a real object to the power emitted by a perfect black body.

Question 3

What is the formula for emissivity?

Answer 3

emissivity = power radiated per unit area/ σT^4

Question 4

What is albedo?

Answer 4

The average energy reflected off a macroscopic system compared to the energy incident on the system.

Question 5

What is the formula for albedo?

Answer 5

Total scatterred power/total incident power

Question 6

What is the solar constant?

Answer 6

The average electromagnetic radiation incident on the earth’s outer atmosphere. It is equal to the apparent brightness,

Question 7

What is the greenhouse effect?

Answer 7

When incoming radiation from the sun is trapped within the earth’s surface.

Question 8

What is the enhanced greenhouse effect?

Answer 8

Natural variations and human activity incresing the concentration of greenhouse gases in the atmosphere thus absorbing more thermal radiation in the Earth’s surface-atmosphere system.

Question 9

What are the greenhouse gases?

Answer 9

Carbon dioxide, methane, nitrous oxide and water vapour.