# science

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• Created by: jennie123
• Created on: 12-03-15 17:13
What substances can convection happen in?
Convection can happen in liquids and gases.
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What type of radiation do all hot objects emit?
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What are the best absorbers of thermal radiation?
Black, dull surfaces are the best absorbers of thermal radiation.
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What are the worst emitters of thermal radiation?
Light, shiny surfaces
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How does heat pass through a single pane of window glass?
Heat passes through a single pane of window glass by conduction and radiation.
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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.
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The useful energy transfer that happens in an electric lamp is:
electricity → light
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'Wasted energy' becomes less useful because:
It becomes increasingly spread out.
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Which equation can be used to calculate the efficiency of an energy transfer?
Efficiency = useful energy out ÷ total energy in.
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In a certain device, 25% of the energy is usefully transferred. The energy efficiency of this device is:
25%
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A coal-fired power station is 40% efficient. This means that:
40% of the chemical energy stored in coal is transferred to electrical energy
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The energy transferred by an electrical appliance can be calculated using this equation:
energy = power × time
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How much energy is transferred by a 500 W electric drill in 30 seconds?
15,000 J
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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.
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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.
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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.
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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?
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Where does the heat energy for geothermal energy resources come from?
From radioactive decay in rocks
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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.
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What are the units of frequency?
Hz are the units of frequency.
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Some types of waves are longitudinal. This means that the oscillations are:
They are transverse.
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## Other cards in this set

### Card 2

#### Front

What type of radiation do all hot objects emit?

### Card 3

#### Front

What are the best absorbers of thermal radiation?

### Card 4

#### Front

What are the worst emitters of thermal radiation?

### Card 5

#### Front

How does heat pass through a single pane of window glass?