Sb4 Flashcards
(20 cards)
Waves on the surface of water
Are transverse waves
Transverse waves
Particles move up and down and right angles to the direction the wave is moving
Waves transfer
Energy
Longitudinal waves
Particles move backwards and forwards in the same direction as the wave
What waves do earthquakes produce
Seismic waves
What do longtitudinal seismic waves do
Push and pull rock material , up and down
What do transverse seismic waves do
Move rock side to side
Wave frequency
Number of waves passing a point each second
Measured in Hertz
What does wave frequency determine?
In sound, it determines the pitch
In light it determines the colour
Period in waves
The length of time it takes one wave to pass a given point
Wavelength definition
The distance from a point on one wave to the same point on the next wave, measured in metres
Amplitude
Maximum distance of a point on the wave away from its rest position
The greater the amplitude of a sound wave, , the louder the sound
Measured in metres
Wave speed equation
Wave speed = distance / time
Wave speed equation including frequency and wavelength
Wave speed m/s= frequency Hz x wavelength m
What does a speed of the wave depend on
The medium it is travelling through
Light wave speeds in different mediums
Travels at 300000000 m/s in a vacuum
Slower in glass and water
When it slows down the wavelength reduces
Measuring speeds of waves on the water
Measure the time it takes for the wave to travel between two fixed points like buoys. Then use the speed time distance equation
Refraction
Change in direction of waves when they enter a different medium
Where does the wave refract when it goes from air to water/glass
Towards the normal
Where does the wave refract when it goes from water/glass to air
Away from the normal
