Flashcards
Sem título
Flashcards do conjunto (23)
- 1WavelengthDistance from one peak to another
- 2FrequencyThe amount of complete waves there are per second
Measured in Hertz (Hz) - 3Amplitudethe height of the wave
- 4SpeedHow fast it goes
- 5Formula - SpeedSpeed = Frequency * Wavelength
- 6Formula - Wave SpeedDistance / Time
- 7Reflected Waveswhen a wave hits a boundary between one medium and another, some of the energy is reflected.
the light is reflected back at you! - 8Refracted WavesWaves travel at different speeds in substances which have different densities.
EM waves travel slower in dense media. - 9Transverse WavesThe vibrations are at 90 degrees to the direction the wave is travelling in.
- 10Longitudinal WavesThe vibrations are along the same direction as the wave is travelling in
- 11Radio Wavesused to broadcast TV and Radio signals and to transmit satellite signals
- 12Microwavesused for communication to and from satellites. you need to use microwaves which can pass easily through the Earths watery atmosphere
- 13Infrared RadiationAlso known as heat radiation. its given out by all hot objects and the hotter the object the more infrared raditation it gives out
- 14Optical Fibrescarry data over long distances as pulses of infrared radiation for example in telephone cables
- 15Infrared has many uses...cooking eg. in grills and toasters
remote controlls transfer information to TV's and DVD players - 16Radiotherapyhigh doses of gamma rays will kill living cells. this means they can be used to treat cancers
have to use the right dosage and direct it carefully so that it does not kill too many normal cells. - 17Electrical Energywhenever a current flows
- 18Light Energyfrom the Sun, Light bulbs etc
- 19Sound Energyfrom anything noisy such as loudspeakers
- 20Kinetic Energyanything that is moving has it
- 21Elastic Potential Energypossessed by anything which can fall
- 22Chemical Energypossessed by foods, fuels, batteries etc.
- 23Ionising radiationtwo types of ionising radiation Alpha ( ) and Beta ( )
emitted all the time by radioactive sources when their nuclei decay
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- FlashCards sobre Sem título, criado por emma.dodd03 em 19-05-2015.
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- emma.dodd03
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