Light energy is absorbed by the silicon atoms, electrons are knocked out and move around the circuit, causing current to flow
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Advantages and disadvantages of photocells
A: Low maintenance, No cable required, Renewable energy source. D: Doesn't work in the dark or when cloudy
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How does the greenhouse effect warm the Earth?
Short wavelength radiation penetrates the atmosphere, the Earth emits longer wavelength radiation (heat) and greenhouse gases absorb this emitted radiation
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Give the natural and man-made causes of the main greenhouse gases
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