Flashcards
Electromagnetic radiation: spectrum, photons and uses
Flashcards do conjunto (21)
- 1What is the pattern produced when white light shines through a prism?The visible spectrum.
- 2What speed do all types of electromagnetic radiation travel at through a vacuum?300,000 km/s
- 3What does Electromagnetic radiation come in?Tiny ‘packets’ called photons.
- 4What do photons deliver?Different quantities of energy, with radio photons delivering the smallest amount, and gamma photons delivering the greatest amount of energy.
- 5What does the intensity of electromagnetic radiation depend on?The energy in each photon, and the number of photons arriving each second.
- 6What does the Earth's atmosphere absorb?Infrared radiation.
- 7What are the processes that remove carbon dioxide from the air?Photosynthesis by plants and
dissolving in the oceans. - 8What are the processes that return carbon dioxide from the air?- Respiration by plants, animals and microbes
-Combustion (e.g. burning wood)
-Thermal decomposition of limestone - 9What are decomposers in charge of?They break down the remains of dead plants and animals and, in doing so, release carbon dioxide through respiration.
- 10How have humans impacted on the increase of carbon dioxide?-Burning more and more fossil fuels as energy sources
-Burning large areas of forests to clear land, which means that there is less photosynthesis removing carbon dioxide from the air. - 11What can global warming cause?Climate change and
extreme weather conditions in some areas. - 12What does the ozone layer do?Absorbs ultraviolet because ultraviolet ionises the ozone, which then changes to oxygen.
- 13What is used to transmit information such as computer data, telephone calls and TV signals?Infrared light, microwaves and radio waves.
- 14Microwaves can transmit...signals such as mobile phone calls.
- 15Radio waves are used to transmit...television and radio programmes.
- 16Define analogue signals.They vary continuously in amplitude, frequency or both.
- 17Define digital signals.A series of pulses with two states - on (shown by the symbol ‘1’) or off (shown by the symbol ‘0’).
- 18What are the risks of too much exposure to the sun?Skin cancer,
- 19What are the benefits of sunbathing?Sunbathing produces a sun tan, which many people find more attractive.
It also produces vitamin D in the skin. - 20Name the types of electromagnetic radiation from highest frequency to the lowest.Gamma radiation, x-rays, ultraviolet radiation, visible light, infrared radiation microwaves and radio waves.
- 21What can photons do if they have enough energy?Break molecules into bits called ions.
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