P13 0.0 / 5 ? PhysicsElectromagnetic SpectrumGCSEAQA Created by: sophielouise277Created on: 29-03-19 17:07 What are the waves in the electromagnetic spectrum? Radio,micro, infrared, visible light, ultraviolet, x ray, gamma ray 1 of 33 What do electromagnetic wave? Waves that do not transfer matter 2 of 33 What does the energy they transfer depend upon? The wavelength of the wave 3 of 33 What happens to wavelength as you go from radio waves to gamma rays? Decreases 4 of 33 What speed do electromagnetic waves travel at? 300 million m/s 5 of 33 What is the pattern for freq and wavelength? The shorter the wavelength the higher the freq 6 of 33 What does energy do as freq increases? It increases 7 of 33 What is white light? All colours of visible spectrum in it 8 of 33 What happens as an object gets hotter? The more infrared radiation it emits 9 of 33 What is an affect of infrared radiation? Burns, kill, damage skin cells 10 of 33 Why are optical fibres usually infrared instead of white light? Infrared is absorbed less than visible light by glass fibres 11 of 33 What is a use of microwaves? Communication e.g. Tv satellite 12 of 33 What is a use of radiowaves? Radio,tv phone signals 13 of 33 Why can microwaves + radio waves be dangerous? Penetrate body and heat internal parts 14 of 33 What are carrier waves? Waves used to carry any type of signal 15 of 33 The shorter the wavelength of a wave the what? More info it can carry, shorter the range and less they spread out 16 of 33 Why are children more affected by mobile phone radiation? Thinner skulls so radio signals can pass through 17 of 33 What happens in optical fibres? The light or infrared radiation are reflected back 18 of 33 Why are optical fibres better than microwaves + radiowaves? Carry more info, light has shorter wavelength and they are more secure fibres stay inside 19 of 33 What happens to some chemicals if they absorb UV? Emit light 20 of 33 Why are UV harmful? Harmful to eye can cause blindness and cause can skin to burn, skin cancer and skin ages prematurely 21 of 33 How to prevent UV damage? Suncream, in sunbed dont go over time and wear goggles 22 of 33 Why are UV more dangerous? Smaller wavelength, more energy 23 of 33 What will stop x ray and gamma ray? Thick plate of metal of lead 24 of 33 What are the similarities between gamma ray and x ray? Both short wavelength, both carry more energy 25 of 33 What are the differences between gamma ray and x ray? X ray produce when electrons at high speed are stopped, gamma ray produced by radioactive substance and gamma have shorter wavelength 26 of 33 Why are x ray used to detect internal cracks? The more dense substance is the more x rays it absorbs 27 of 33 What are some uses of gamma rays? Killing harmful bacteria e.g. surgical instruments, food. Killing cancer cells 28 of 33 What is ionisation and how do gamma and x ray do it? They knock electrons out of atoms and they become charged 29 of 33 What can this ionisation do? Cause cell death, gene mutation and cancer growth 30 of 33 What must people who work with radiation do? Wear film badge so they can take time off if they are exposed to too much 31 of 33 What is a contrast medium? A substance that an organ with soft tissue can be filled with 32 of 33 What is the purpose of this medium and give example? Allows x rays to be absorbed easier and in stomach, given barium meal 33 of 33
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