Topic 8 - Energy, Power And Climate Change

Question 1

Stefan-Boltzmann law

Answer 1

Power per unit area emitted by a body is proportional to the absolute temperature to the fourth power

Question 2

Energy density

Answer 2

The energy density of a fuel is the energy that can be obtained from unit mass of the fuel

Question 3

Albedo

Answer 3

The albedo of a body is defined as the ratio of the power of radiation reflected or scattered from the body to the total power incident in the body.

Question 4

Surface heat capacity

Answer 4

Surface heat capacity of a body is the energy required to increase the temperature of 1m^2 of the surface by 1K (kelvin).

Question 5

Coefficient of Volume expansion

Answer 5

Coefficient of volume expansion is the fractional change in volume per unit temperature change.

Question 6

Emissivity

Answer 6

Is the ratio of energy emitted (per unit area) of a body to the energy emitted by a black body of the same dimensions at the same temperature