Bong Ro
IB Questionbank Physics
Energy, Power and Climate
1.
In which of the following places will the albedo be greatest? A. B. C. D. A forest A grassland An ocean A polar ice cap
(Total 1 mark)
2.
A spherical black body has absolute temperature T1. The surroundings are kept at a lower absolute temperature T2. What is the net power per unit area lost by the body? A. B. C. D. σT14 σT24 σ(T14 – T24) σ(T14 + T24)
(Total 1 mark)
IB Questionbank Physics
1
3.
What is the unit of surface heat capacity? A. B. C. D. J kg–1 K–1 J K–1 J m–2 K–1 J m–3 K–1
(Total 1 mark)
4.
Surface X has a temperature TX and emissivity εx. Surface Y has a temperature TY and emissivity εy. The two surfaces emit radiation at the same rate. What is the ratio
TX ? TY
1
A.
εy ε x
εx εy
εy ε x εX εy
4
1
B.
4
4
C.
4
D.
(Total 1 mark)
IB Questionbank Physics
2
5.
Large areas of rainforests are cut down and burned every year. The result of these actions is A. B. C. D. reduced albedo. reduced carbon fixation. increased evaporation rate. increased mass of atmospheric methane.
(Total 1 mark)
6.
Simple harmonic motion and the greenhouse effect (a) A body is displaced from equilibrium. State the two conditions necessary for the body to execute simple harmonic motion. 1. ......................................................................................................................... ......................................................................................................................... 2. ......................................................................................................................... .........................................................................................................................
(2)
IB Questionbank Physics
3
(b)
In a simple model of a methane molecule, a hydrogen atom and the carbon atom can be regarded as two masses attached by a spring. A hydrogen atom
Energy, Power and Climate
1.
In which of the following places will the albedo be greatest? A. B. C. D. A forest A grassland An ocean A polar ice cap
(Total 1 mark)
2.
A spherical black body has absolute temperature T1. The surroundings are kept at a lower absolute temperature T2. What is the net power per unit area lost by the body? A. B. C. D. σT14 σT24 σ(T14 – T24) σ(T14 + T24)
(Total 1 mark)
IB Questionbank Physics
1
3.
What is the unit of surface heat capacity? A. B. C. D. J kg–1 K–1 J K–1 J m–2 K–1 J m–3 K–1
(Total 1 mark)
4.
Surface X has a temperature TX and emissivity εx. Surface Y has a temperature TY and emissivity εy. The two surfaces emit radiation at the same rate. What is the ratio
TX ? TY
1
A.
εy ε x
εx εy
εy ε x εX εy
4
1
B.
4
4
C.
4
D.
(Total 1 mark)
IB Questionbank Physics
2
5.
Large areas of rainforests are cut down and burned every year. The result of these actions is A. B. C. D. reduced albedo. reduced carbon fixation. increased evaporation rate. increased mass of atmospheric methane.
(Total 1 mark)
6.
Simple harmonic motion and the greenhouse effect (a) A body is displaced from equilibrium. State the two conditions necessary for the body to execute simple harmonic motion. 1. ......................................................................................................................... ......................................................................................................................... 2. ......................................................................................................................... .........................................................................................................................
(2)
IB Questionbank Physics
3
(b)
In a simple model of a methane molecule, a hydrogen atom and the carbon atom can be regarded as two masses attached by a spring. A hydrogen atom