Physics p2

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Explain why digital signals usually of better quality than analogue signals.
Digital signals only have two states on or off so they can still be recognised despite any noise that's picked up. This means interference can be removed.
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Name three ways in which digital signals can be stored.
Hard drive or memory stick or USB or DVD/CD/Floppy disk.
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Give to ways in which global warming might result in more extreme weather events.
Increased convection and larger amounts of water vapour in the hotter atmosphere
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Explain why a signal which has been affected by noise can be recovered more easily if it's digital than if it's an analogue signal. (finish answer)
With a digital signal affected by noise it's still possible to read the two-state pattern of '1's and '0's so the signal can be recovered. With analogue signals having any value noise completely changes some of the signal making it almost impossible
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What does the amount of heat created depend on?
The intensity of the radiation beam and the duration of the exposure.
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What are the three factors that decrease the intensity of radiation with distance?
Photons spread out as they travel, some photons are absorbed by particles in the substances they pass through and some photons are reflected and scattered by other particles.
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What is ionising radiation and what does it do? Give some examples of ionising radiation aswell.
Ionising radiation is electromagnetic radiation with high photon energy which can break molecules into bits called ions. Examples of ionising radiation are ultraviolet radation, x-rays and gamma rays.
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Radiation damages living cells in different ways: (finish answer)
The heating effect can damage the skin. Ionising radiation can age the skin. It can also mutate DNA which can lead to cancer. Different amounts of exposure can cause different effects eg high intensity ionising radiation can destroy cells leading to
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What PPE must be worn when going into areas of high radiation?
A radiation suit as a shield and have a radiation dose monitor.
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What is the ozone layer and what does it do?
A thin layer of gas in the Earth's upper atmosphere which absorbs some of the Sun's ultraviolet radiation before it reaches Earth.
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Carbon (finish answer)
(insert)
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What can electromagnetic waves (signal) be carried by?
Radio waves and microwaves (through the Earth's atmosphere and space). Aswell as light waves and infrared waves (through optical fibres).
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How is an analogue signal different from a digital one?
Analogue signals can have any value whereas digital signals can only have '1' or '0'.
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How is data collected about the Earth's changing temperature used?
It it used with climate models to look for patterns in the possible causes of global warming.
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Why is optic fibre use when sending infrared and light radiation?
They can travel huge distances without becoming significantly weaker.
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How does the radiation emitted by the Earth compare with that emitted by the Sun?
The radiation from the Earth has a lower principal frequency.
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Other cards in this set

Card 2

Front

Name three ways in which digital signals can be stored.

Back

Hard drive or memory stick or USB or DVD/CD/Floppy disk.

Card 3

Front

Give to ways in which global warming might result in more extreme weather events.

Back

Preview of the front of card 3

Card 4

Front

Explain why a signal which has been affected by noise can be recovered more easily if it's digital than if it's an analogue signal. (finish answer)

Back

Preview of the front of card 4

Card 5

Front

What does the amount of heat created depend on?

Back

Preview of the front of card 5
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