4.6.1 Waves In Air, Fluids And Solids Flashcards
Waves are what ?
Either transverse or longitudinal
Example of a transverse wave
The ripples on a water surface are an example of a transverse wave
What do longitudinal waves show ?
They show areas of compression and rare faction
Example of a longitudinal wave
Sound waves travelling through air are longitudinal
Describe evidence that the wave itself moves?
For both ripples on a water surface and sound waves in air, it’s the wave and NOT the water or air itself that travels
Describe wave motion in terms of their amplitude, wavelength, frequency and period?
The oscillations are either parallel in longitudinal waves or perpendicular in transverse waves
What is the amplitude of a wave ?
The maximum displacement of a point on a wave away from, it’s undisturbed position
What is the wavelength of a wave?
The wavelength of a wave is the distance from a point on one wave to the equivalent point on the adjacent wave
What is the frequency of a wave?
The frequency of a wave is the number of waves passing a point every second
Period equation
Period = 1/frequency
Period units
Period, t, in seconds, s
Frequency units
Frequency, f, in hertz, Hz
What is the wave speeds
The wave speed is the speed at which the energy is transferred ( or the wave moves) through the medium.
Wave equation
Wave speed = frequency x wavelength
Wave speed units
Wave speed, v, in metres per second, m/s