Black, dull surfaces are the best absorbers of thermal radiation.
3 of 24
What are the worst emitters of thermal radiation?
Light, shiny surfaces
4 of 24
How does heat pass through a single pane of window glass?
Heat passes through a single pane of window glass by conduction and radiation.
5 of 24
The specific heat capacity of water is 4181 J/kg/°C and that of lead is 128 J/kg/°C. This means:
This means more energy is needed to heat water than is needed to heat the same mass of lead by the same amount.
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Insulating a home costs £1800 and saves £50 a year. What is the payback time?
36 years.
7 of 24
The useful energy transfer that happens in an electric lamp is:
electricity → light
8 of 24
'Wasted energy' becomes less useful because:
It becomes increasingly spread out.
9 of 24
Which equation can be used to calculate the efficiency of an energy transfer?
Efficiency = useful energy out ÷ total energy in.
10 of 24
In a certain device, 25% of the energy is usefully transferred. The energy efficiency of this device is:
25%
11 of 24
A coal-fired power station is 40% efficient. This means that:
40% of the chemical energy stored in coal is transferred to electrical energy
12 of 24
The energy transferred by an electrical appliance can be calculated using this equation:
energy = power × time
13 of 24
How much energy is transferred by a 500 W electric drill in 30 seconds?
15,000 J
14 of 24
A 250W computer is switched on for 4 hours. How many Units of electricity does it use?
A 250W computer is switched on for 4 hours. It would use 1 unit of electricity.
15 of 24
Why are coal, oil and natural gas non-renewable resources?
Coal, oil and natural gas non-renewable resources because they cannot be replaced, except over millions of years. Once used, they cannot be used again.
16 of 24
For a given amount of energy released, which fuel releases the most carbon dioxide?
Coal
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Which type of power station takes the least time to start up?
A gas-fired power station takes the least time to start up.
18 of 24
What problem does sulfur dioxide cause?
Sulfur dioxide contributes to acid rain.
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Why are uranium and plutonium used as nuclear fuels?
They are radioactive.
20 of 24
Where does the heat energy for geothermal energy resources come from?
From radioactive decay in rocks
21 of 24
The distance from the crest of one wave to the crest of the next wave is called:
The distance from the crest of one wave to the crest of the next wave is called the wavelength.
22 of 24
What are the units of frequency?
Hz are the units of frequency.
23 of 24
Some types of waves are longitudinal. This means that the oscillations are:
They are transverse.
24 of 24
Other cards in this set
Card 2
Front
What type of radiation do all hot objects emit?
Back
Infra-red radiation
Card 3
Front
What are the best absorbers of thermal radiation?
Back
Card 4
Front
What are the worst emitters of thermal radiation?
Back
Card 5
Front
How does heat pass through a single pane of window glass?
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