# IGCSE Physics section C: Waves

?
What do all waves have
wavelength, frequency, amplitude and speed
1 of 29
what is amplitude
it is the height of the wave
2 of 29
what is wavelength
it is the distance from one peak to the next
3 of 29
what is frequency
it is the number of complete waves per second that pass a certain point
4 of 29
what is speed (velocity)
how fast something goes
5 of 29
what is the formula that includes frequency and time period
f=1/T, frequency=1/time period
6 of 29
what is the wave speed formula
v=fλ, speed= frequency x wavelength
7 of 29
In transverse waves what angle are the vibrations to the direction of the energy transferred by the wave
90
8 of 29
what direction do vibrations in longitudinal waves go
the same direction as the wave transfers energy
9 of 29
what can all waves have done to them
they can all be reflected, refracted and deffracted
10 of 29
what are the seven types of electromagnetic (EM) waves
radio waves, micro-waves, infra-red, visable light, ultra-violet, x-rays, gamma rays
11 of 29
what kind of waves are EM waves
transverse waves
12 of 29
what are radio waves mainly used for and why
communication because the waves can diffract around the curved surface of the earth
13 of 29
why are microwaves used for satellite communication
because they can pass easily through the earths atmosphere without being absorbed
14 of 29
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
15 of 29
what is infra-red radiation used in
heating and monitoring temperature
16 of 29
what can light signals travel in
optical fibres
17 of 29
what is ultra violet used in
fluorescent lamps
18 of 29
why are x-rays used to take pictures of bones
because x-rays easily pass through flesh but not through denser material like bone
19 of 29
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
20 of 29
whats more dangerous an EM radiation with a low frequency or an EM radiation with a high frequency
21 of 29
What does the reflection of light let us do
see things
22 of 29
What is the order of the colour spectrum
red, orange, yellow, green, blue, indigo, violet
23 of 29
what do triangular prisms do to white light
it disperses the light
24 of 29
What is the formula for the refractive index
n=sin i/ sin r, refractive index= sin i(incident ray)/ sin r(refractive ray)
25 of 29
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
26 of 29
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
27 of 29
in a semicircular block what happens if the angle of incidence (i) is greater than the critical angle
there is total internal reflection
28 of 29
what is the formula for the critical angle
sin C=1/n, sin critical angle (C)=1/refractive index
29 of 29

## 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

### Card 4

#### Front

what is frequency

### Card 5

#### Front

what is speed (velocity)

## Similar Physics resources:

See all Physics resources »See all Waves and Sound resources »