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What two features do all seven electromagnetic waves have in common?
All seven groups of electromagnetic waves are transverse and they travel at the same speed in a vacuum (300,000 km/s).
1 of 17
What is the relationship between wavelength and frequency?
As the wavelength increases, the frequency increases.
2 of 17
How does a beam of electromagnetic radiation transfer energy?
A beam of electromagnetic radiation transfers energy in 'packets' called photons. The amount of energy depends on the frequency of the electromagnetic radiation.
3 of 17
Give two factors that affect how much infrared radiation an object emits.
The amount of infrared radiation emitted by an object depends on its temperature and surface.
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What can happen to radiation travelling outwards from a source when it meets a material?
Radiation travels outwards from a source and can be reflected, transmitted or absorbed (or a combination of these) by materials it meets.
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What does the amount of energy transferred to an absorber by a beam of electromagnetic radiation depend on?
The amount of energy transferred to an absorber by a beam of electromagnetic radiation depends on both the number of photons arriving and the energy of each photon.
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Explain how overexposure to the Sun can be dangerous to the body.
Sunlight contains ultraviolet radiation. The energy it transfers to our cells can damage their DNA. If the body is exposed to too much UV the skin cells can be damaged causing sunburn. Can also lead to skin mutation and skin cancer.
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What are the two natural processes that remove carbon dioxide from the air?
The two natural processes that remove carbon dioxide from the air are photosynthesis and dissolving into oceans.
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What are the two natural processes that add carbon dioxide into the atmosphere?
The natural processes that add carbon dioxide to the air are respiration and occasional volcanic eruptions.
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What effect do some of the gases in the earth's atmosphere have on the infrared radiation emitted from the earth's surface?
The infrared radiation emitted from the earth's surface is absorbed or reflected back by some of the gases in the earth's atmosphere. This keeps the Earth warmer than it would be otherwise and is called the greenhouse effect
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How does the Ozone layer protect us from the sun?
The ozone layer absorbs UV radiation from the sun and so protects us from receiving too much.
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During the last 200 years how have humans increased the concentration of carbon dioxide in the atmosphere?
During the last 200 years humans have increased the concentration of carbon dioxide in the atmosphere by burning fossil fuels and cutting down forests.
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In the future, global warming could cause more extreme weather events such as hurricanes, floods and droughts. Explain why.
In the future, global warming could cause more extreme weather events such as hurricanes, floods and droughts, due to increased convection (stronger winds) and larger amounts of water vapour (increased rainfall) in the warmer atmosphere.
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What are the uses of radio waves?
Radio waves are used to broadcast television and radio programmes. They can also be used by emergency services for communication purposes.
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Why are microwaves more useful than radio waves for satellite communications?
Microwaves have shorter wavelengths than radio waves so they can pass more easily through the atmosphere. This makes them very useful for satellite communications.
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Why is a HD television picture more detailed than standard definition?
A HD television picture is more detailed than standard definition because more information has been transmitted to the television
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Give two advantages of digital signals over analogue signals.
Adv. of digital over analogue include: If the original sound has been affected by noise (disturbance) it can be recovered more easily. And the information can be easily stored and processed by computers.
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Other cards in this set

Card 2

Front

What is the relationship between wavelength and frequency?

Back

As the wavelength increases, the frequency increases.

Card 3

Front

How does a beam of electromagnetic radiation transfer energy?

Back

Preview of the front of card 3

Card 4

Front

Give two factors that affect how much infrared radiation an object emits.

Back

Preview of the front of card 4

Card 5

Front

What can happen to radiation travelling outwards from a source when it meets a material?

Back

Preview of the front of card 5
View more cards

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