8.2.b Energy production, solar cells, albedo

How would the maximum power of a wind turbine change if you doubled the wind speed and tripled the length of the turbine blade?

• x27

• x4

• x8

• x72

• x64

Answer explanation

double cubed (8) x triple squared (9)

The radiation falling on the earth is 1400W m^-2. A quarter of that is absorbed and the rest is reflected.

What is the value for the albedo?

Answer explanation

3/4 of radiation is reflected

What is the maximum intensity of the suns radiation received on the earth?

• 1400Wm^-2

• 700Wm^-2

• 350Wm^-2

• 350W

• 1400W

What is the average intensity of the suns radiation received on the earth?

• 1400Wm^-2

• 700Wm^-2

• 350Wm^-2

• 350W

• 1400W

What is the name of the process by which uranium is made to contain at least 3% U235?

What part of the nuclear reactor that absorbs the energy from the high energy neutrons so that they can go slow enough to induce further fission.

What is the part of the nuclear reactor that controls the rate of nuclear reaction

when one U236 fissions it produces a number of neutrons that cause further fissions. What is this called?

What has the highest albedo?

• the oceans

• Ice in the Arctic or Antarctic

• the ground

• roads

The diagram shows an atom of uranium-235 being split into several pieces. Name the process shown in the diagram.

• nuclear fission

• nuclear fusion

• chemical reaction

• chain reaction