Flashcards
physics 2.2
Flashcards do conjunto (53)
- 1what equation links period, frequency and 1period = 1 / frequency
- 2what is a transverse waveoscillates perpendicular to energy
- 3what type of wave are all electromagnetic wavestransverse
- 4what is a longitudinal waveoscillates parallel to the energy
- 5what equation links frequency, wavelength and wave speedwave speed = frequency x wavelength
- 6what is an oscilloscopedevice used to detect sound wavelength, used with 2 microphone
- 7what 3 things can happen to all wavesabsorbed by a material, transmitted through a material or reflected off the material
- 8what is the rule for angle of incidence and angle of reflectionthey are equal
- 9what is the normal line on a ray diagraman invisible line perpendicular to the surface
- 10what does a specular reflection look likethe rays coming off all point in the same direction
- 11what sort of surfaces are specular rays onsmooth
- 12what is a diffuse reflectionwhere the reflected rays are all pointing in different directions
- 13what sort of surfaces are diffuse rays onrough or uneven surfaces
- 14what are the waves on the electromagnetic spectrumradio, micro, infrared, visible light, UV, X rays, gamma rays
- 15what wave on the EM spectrum has the highest frequencygamma rays
- 16what wave on the EM spectrum has the highest wavelengthradio waves
- 17what does refraction depend onthe change in density between the 2 materials
- 18true or false - when a wave is refracted, the wavelength and frequency changefalse - the wavelength changes but the frequency stays the same
- 19what produces electromagnetic wavesalternating currents produce oscillating electric and magnetic fields so waves are produced
- 20how are radio waves used to communicationthe wave signal is produced from the transmitter and bounce off the ionosphere and hits the receiver so it can send the waves to the home
- 21what are microwaves used for and how does it workthey send messages up to satellites as it can travel through the earth's atmosphere and hits the satellite, where it receives the message and then reflects it back down to earth
- 22how do microwaves in ovens workpenetrate the food and hit the water molecules inside which gives them energy so they heat up, therefore the food quickly cooks
- 23true or false - the hotter an object is the more IR is given offtrue
- 24how do fibre optic cables use visible light to transfer dataoptical fibres (glass or plastic fibres) reflect the light rays back and forth over the fibre
- 25give 3 uses of UV radiationfluorescent lights (energy efficient too), security pens as invisible ink, produced by the sun and gives people tans, can give people artificial tans
- 26how do X-rays work / only show bonesthe X-rays don't pass through denser material like bones or metal but pass easily through flesh
- 27give 2 uses of gamma rayskill cancer cells and use as a medical tracer
- 28why do low frequency waves not damage our body that muchthey don't transfer too much energy unlike high frequency waves
- 29what are some issues caused by UV rays and how are they causedsunburn, skin to age prematurely, blindness, increased risk of skin cancer, caused by damaging surface cells
- 30why are X-rays and gamma rays so dangerousbecause they are types of ionising radiation
- 31what is the unit for radiation doses of the risk of harmSv
- 32what does a convex lens cause light rays to doconverge / move closer together
- 33what does a concave lens cause light rays to dodiverge / all move away from each other
- 34what are the primary colours which cant be made by mixing others togetherred, green and blue
- 35why are do opaque objects have colourbecause they reflect some waves off of it when all are absorbed
- 36what causes an object to be whiteit reflects all wavelengths equally
- 37what causes an object to be blackabsorbs all wavelengths of light
- 38why are some objects transparentthey transmit light so some wavelengths pass through
- 39briefly describe a practical to investigate IR emissionleslie cube with one side matt black, matt white, shiny metal and dull metal, put boiling water inside the leslie cube and use a infrared detector to see how much is emitted form each side after a certain amount of time
- 40what is a perfect black bodyan object which absorbs all radiation that hits it and none if reflected or transmitted
- 41what depends on the temperature of an object in terms of wavelengthsintensity and distribution
- 42what does the overall temperature of the earth depend onthe amount of radiation emitted, reflected and absorbed
- 43in what state does sound waves travel fastest insolids
- 44why cant sound travel in spaceit is a vacuum so there are no particles to oscillate
- 45how do you hear a soundthe soundwaves cause the eardrum to oscillate which are passed onto tiny bones in your ear, which are turned into electrical signals which are sent to your brain
- 46what limits human hearingshape and size of eardrum, structure of the ear
- 47define ultrasoundsound waves that have frequencies above the capacity of human hearing
- 48how does ultrasound workwhen the wave hits a certain / some boundaries, the waves are reflected back or can carry on travelling to a different boundary
- 49give 3 uses of ultrasoundmedical imaging e.g. scanning for a foetus, industrial imaging e.g. finding flaws in materials, in a submarine to find the depth of water
- 50what happens in an earthquake in terms of wavesseismic waves are produced and when they reach boundaries some are reflected and some are absorbed
- 51what are the 4 layers of the earth from outer to innercrust, almost solid mantle, liquid outer core, solid inner core
- 52give 3 facts about P-waveslongitudinal, travel through solids and liquids, faster than S-waves
- 53give 3 facts about S-wavestransverse, can only travel through solids, slower than P-waves
Informações
- Descrição
- Physics FlashCards sobre physics 2.2, criado por Olivia Harlington em 20-04-2019.
- Criado por
- Olivia Harlington · abr 2019
- Atualizado
- 21 abr 2019
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