Three of the em waves are ionising so they can make charged particles (ions) The ions are radioactive and can cause damage to cells (gamma, xray and UV)
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Benefits of the electromagnetic spectrum?
Gamma can treat cancer and sterilize surgical equipment. xray can diagnose fractures and detect guns and uv is necessary for vitamin D
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What colour absorbs heat better?
Black
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Effects of global warming?
Ice caps melt, Places get colder, animals find it hard to adapt, sea levels rise (flooding)
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What happens in global warming?
The earth recieves UV, infrared and visable light from the sun, some is absorbed by the atmosphere, some send back. some of the infrared is sent back to the earth causing global warming.
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What lowers the intensity of a wave beam?
The distance you are from it.
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Radiation protection?
Metal case in a microwave, lead screens for xrays, sunscreen and clothing from uv
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Two ways in which radiation can damage cells?
Mutate (cancer), Die
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Global warming leads to..
Climate change, extreme weather, rising sea
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What is analogue?
A wave carrying information that can have almost any value
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What is digital?
A wave carrying information just using two values
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Benefit of using a digital signal?
You can't notice the noise as the two values can be recognised. this means no interference.
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Other cards in this set
Card 2
Front
Benefits of the electromagnetic spectrum?
Back
Gamma can treat cancer and sterilize surgical equipment. xray can diagnose fractures and detect guns and uv is necessary for vitamin D
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