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27 Cards in this Set
- Front
- Back
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What do waves transfer?
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Energy and information NOT matter
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In longitudinal waves, how are vibrations of particles in relation to the direction of travel?
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Parallel
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In transverse waves, how are vibrations of particles in relation to the direction of travel?
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Perpendicular
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What are longitudinal waves responsible for?
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Sound
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What are transverse waves responsible for?
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Light
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Label A, B and C
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A; compression
B; rarefraction C; wavelength |
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Label A, B, C, D and E
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A; Trough
B; Valley C; Peak D; Amplitude E; Wavelength |
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What is frequency measured in?
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Hertz
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What is time period measured in?
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Seconds
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Define 'frequency'
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Number of complete waves passing a point every second
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Define 'period'
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The time taken for one complete wave to pass a point.
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What is the equation linking frequency and period?
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1=T x f
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What is amplitude and what is it measured in?
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Amps.
For both types of wave it's the maximum distance from equilibrium position |
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What is wavelength measured in?
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Metres
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What is wavelength in transverse waves?
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The distance between two peaks or troughs
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What is wavelength in longitudinal waves?
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The distance between the middle of two compressions.
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Equation for wave speed?
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V = wavelength x freq
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Name four common properties of the electromagnetic spectrum
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Transverse
Speed of 3x10(8) m/s Travel in vaccum Refract, reflect, diffract |
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A large wavelength gives a ...... freq
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Small
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Name all 7 parts of the electromagnetic spectrum
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Radio
Microwave Infrared Visible Ultraviolet X-ray Gamma ray |
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Give source, detectors, use and dangers of radio waves
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Radio transmitters
Radio receivers Communications No |
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Give source, detectors, use and dangers of microwaves
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Transmitters and ovens
Receiver Mobile phones, cooking, satellites Yes |
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Give source, detectors, use and dangers of infrared
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Anything warm
Skin, sensors Remote control, cooking and heating Burns |
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Give source, detectors, use and dangers of visble light
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Luminous objects
Eyes, photgraphic film, LDRs Seeing, fibre optics No |
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Give source, detectors, use and dangers of ultraviolet
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Lamps, sun
Skin, chemicals, film Sun beds, crime prevention, fluorescent lights Skin cancer, eye damage |
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Give source, detectors, use and dangers of x-ray
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x-ray tubes
Special photographic film Detecting broken bones yes |
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Give source, detectors, use and dangers of gamma
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Radioactive sources
Geiger muller tube Radio therapy, tracing, sterilising Causes cancer |
