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25 Cards in this Set
- Front
- Back
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Edexcel P1 Topic 2
The Electromagnetic Spectrum |
If you can answer all of the questions on these cards then you need all you need to know to ace your exam! |
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What did Herschel discover and how?
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He discovered infrared light, by noticing that red light was warmer than violet light- and just beyond red light where there was no visible light was even warmer.
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What did Ritter discover?
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He discovered ultraviolet light, because ne knew that silver chloride turned black more quickly in violet light than red light- and it turned black the fastest when exposed to the non- visible rays just beyond the violet light, ultraviolet radiation. |
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Where do electromagnetic waves travel at the same speed- what is the speed?
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In a vacuum at: 3 x 10 to the power of 8
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What is the electromagnetic spectrum in order of increasing frequency? |
radio waves, micro waves, infra-red radiation, visible rays, ultraviolet rays, x rays, gamma rays
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What is the order of the visible spectrum in decreasing wavelength?
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red, orange, yellow, green, blue, indigo, violet
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What has a longer wavelength: radiowaves or gamma rays?
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Radio waves
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What is more dangerous: x rays or microwaves? What does this show?
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X rays are more dangerous, showing that the potential danger increases with frequency
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What is the potential danger of radiowaves?
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There aren't any known dangers
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What is the potential danger of microwaves?
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Can cause internal heating of cells and tissues
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What is the potential danger of infrared radiation?
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Can cause skin burns
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What is the potential danger of visible light?
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There aren't any known dangers
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What is the potential danger of ultraviolet light?
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Can cause temporary 'snow blindness' and can cause damage to cells- leading to skin cancer
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What is the potential danger of x rays?
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Can cause a mutation in the DNA which can kill cells and cause cancer
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What is the potential danger of gamma rays? |
Can cause a mutation in the DNA which can kill cells and cause cancer
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What are the uses of radiowaves?
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Broadcasting, communications, RADAR (satellite transmittions)
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What are the uses of microwaves?
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Cooking, communications (mobile phones)
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What are the uses of infrared radiation?
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Cooking, thermal imaging, optical fibres, tv remote controls
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What are the uses of visible light?
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Photography, scanning (iris scanning), ilumination |
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What are the uses of ultraviolet light?
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Security marking, fluorescent inks, detecting forged bank notes, disinfecting water
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What are the uses of x rays?
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Airport security scanning, medical X-rays, observing the internal structure of objects
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What are the uses of gamma rays?
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Detecting cancer cells, killing cancer cells, sterilising medical equipment and food |
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What is ionising radiation?
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Radiation that can transfer enough energy to remove electrons from atoms, leaving positively charged ions.
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What is ionising radiation always given out by?
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Radioactive sources
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What are three types of ionising radiation and what are their characteristics? |
* Alpha particles- larger and move more slowly* Beta particles- smaller and move faster* Gamma rays- electromagnetic radiation
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