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Science P1 Topic 2
GCSE edexcel core sceince physics: the electromagnetic spectrum
Question | Answer |
---|---|
What did Herschel discover and how? | 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. |
What did Ritter discover? | 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. |
Where do electromagnetic waves travel at the same speed- what is the speed? | In a vacuum at: 3 x 10 to the power of 8 |
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 |
What is the order of the visible spectrum in decreasing wavelength? | red, orange, yellow, green, blue, indigo, violet |
What has a longer wavelength: radiowaves or gamma rays? | Radio waves |
What is more dangerous: x rays or microwaves? What does this show? | X rays are more dangerous, showing that the potential danger increases with frequency |
What is the potential danger of radiowaves? | There aren't any known dangers |
What is the potential danger of microwaves? | Can cause internal heating of cells and tissues |
What is the potential danger of infrared radiation? | Can cause skin burns |
What is the potential danger of visible light? | There aren't any known dangers |
What is the potential danger of ultraviolet light? | Can cause temporary 'snow blindness' and can cause damage to cells- leading to skin cancer |
What is the potential danger of x rays? | Can cause a mutation in the DNA which can kill cells and cause cancer |
What is the potential danger of gamma rays? | Can cause a mutation in the DNA which can kill cells and cause cancer |
What are the uses of radiowaves? | Broadcasting, communications, RADAR (satellite transmittions) |
What are the uses of microwaves? | Cooking, communications (mobile phones) |
What are the uses of infrared radiation? | Cooking, thermal imaging, optical fibres, tv remote controls |
What are the uses of visible light? | Photography, scanning (iris scanning), ilumination |
What are the uses of ultraviolet light? | Security marking, fluorescent inks, detecting forged bank notes, disinfecting water |
What are the uses of x rays? | Airport security scanning, medical X-rays, observing the internal structure of objects |
What are the uses of gamma rays? | Detecting cancer cells, killing cancer cells, sterilising medical equipment and food |
What is ionising radiation? | Radiation that can transfer enough energy to remove electrons from atoms, leaving positively charged ions. |
What is ionising radiation always given out by? | Radioactive sources |
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 |