Electromagnetic spectrum + refraction 0.0 / 5 ? PhysicsElectromagnetic SpectrumGCSEEdexcel Created by: Jazzy15Created on: 27-03-19 21:13 What is visible light ? A portion of the spectrum that is visible to the human eye - our eyes detect certain frequencies of light 1 of 20 What do lower frequencies of visible light appear to show ? Red 2 of 20 What do higher frequencies of visible light appear to show ? Blue 3 of 20 The angle of refraction method (point 1) Place plain paper on desk and set up power supply, ray box and single slit - this shines one ray of light across the paper on desk. 4 of 20 The angle of refraction method (point 2) Place rectangular glass block on paper. Draw around block 5 of 20 The angle of refraction method (point 3) Shine ray of light into your block. Use small crosses to mark where the light ray goes 6 of 20 The angle of refraction method (point 4) Block off paper. Use ruler to draw a line through crosses - shows path of the light ray 7 of 20 The angle of refraction method (point 5) Join points where light enters + exits the block - shows path of light inside block 8 of 20 The angle of refraction method (point 6) Measure angles of incidence + refraction 9 of 20 The angle of refraction method (point 7) repeat points 3 and 6 with ray entering block at different angels 10 of 20 What does angle of refraction mean ? (bend)A ray of light may approach the boundary at an angle of incidence of 45-degrees and bend towards the normal 11 of 20 What does angle of incidence do ? A ray of light hits a surface at a point. From that point the line straight up, at 90 degrees to the surface, is called the normal 12 of 20 What has the highest frequency on the spectrum ? Gamma rays 13 of 20 What has the lowest frequency on the spectrum ? Radio waves 14 of 20 What are microwaves used for ? Communications + satellite transmissions + heating up your food in a microwave oven 15 of 20 What is infrared used for ? Communication - computers - tv + remote control - toaster + grill - security systems 16 of 20 What are radio waves used for ? Transmitting radio broadcasts and tv programmes 17 of 20 What is ultraviolet used for ? To disinfect water by killing microorganisms in it + used to detect forgery 18 of 20 What are x-rays used for ? See broken bones and hidden bombs 19 of 20 What are gamma rays used for ? To kill cancer cells and sterilise 20 of 20
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