| Front | How can the internal energy of a system be increased? |
| Back | by heating it or by changing its shape |
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| Front | What is pulse broadening? |
| Back | The signal sent down the fibre is broader at the other end, they can also overlap each other and confuse the signal. |
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| Front | What is intensity of an object? |
| Back | The power received from it per unit area at Earth |
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