IGCSE Physics section C: Waves

What do all waves have
wavelength, frequency, amplitude and speed
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what is amplitude
it is the height of the wave
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what is wavelength
it is the distance from one peak to the next
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what is frequency
it is the number of complete waves per second that pass a certain point
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what is speed (velocity)
how fast something goes
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what is the formula that includes frequency and time period
f=1/T, frequency=1/time period
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what is the wave speed formula
v=fλ, speed= frequency x wavelength
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In transverse waves what angle are the vibrations to the direction of the energy transferred by the wave
90
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what direction do vibrations in longitudinal waves go
the same direction as the wave transfers energy
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what can all waves have done to them
they can all be reflected, refracted and deffracted
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what are the seven types of electromagnetic (EM) waves
radio waves, micro-waves, infra-red, visable light, ultra-violet, x-rays, gamma rays
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what kind of waves are EM waves
transverse waves
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what are radio waves mainly used for and why
communication because the waves can diffract around the curved surface of the earth
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why are microwaves used for satellite communication
because they can pass easily through the earths atmosphere without being absorbed
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why are microwaves used for cooking food
because the waves are absorbed by the water molecules found in food heating them up so that the whole piece of food is cooked
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what is infra-red radiation used in
heating and monitoring temperature
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what can light signals travel in
optical fibres
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what is ultra violet used in
fluorescent lamps
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why are x-rays used to take pictures of bones
because x-rays easily pass through flesh but not through denser material like bone
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why is gamma radiation used for sterilising food and medical equipment
because it kills all microbes and when used on food it keeps food fresh for longer
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whats more dangerous an EM radiation with a low frequency or an EM radiation with a high frequency
high frequency EM radiation such as Gamma radiation
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What does the reflection of light let us do
see things
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What is the order of the colour spectrum
red, orange, yellow, green, blue, indigo, violet
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what do triangular prisms do to white light
it disperses the light
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What is the formula for the refractive index
n=sin i/ sin r, refractive index= sin i(incident ray)/ sin r(refractive ray)
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in a semicircular block what happens if the angle of incidence (i) is less than the critical angle
there is a partially reflected ray but most light passes out
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in a semicircular block what happens if the angle of incidence (i) is equal to the critical angle
there is a strongly reflected ray but an emerging ray comes out along the top
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in a semicircular block what happens if the angle of incidence (i) is greater than the critical angle
there is total internal reflection
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what is the formula for the critical angle
sin C=1/n, sin critical angle (C)=1/refractive index
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Other cards in this set

Card 2

Front

what is amplitude

Back

it is the height of the wave

Card 3

Front

what is wavelength

Back

Preview of the front of card 3

Card 4

Front

what is frequency

Back

Preview of the front of card 4

Card 5

Front

what is speed (velocity)

Back

Preview of the front of card 5
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