Wave Motion Flashcards
What is a transverse wave?
Transverse waves are oscillations perpendicular to the source
What is a longitudinal wave?
Oscillations run parallel to the source
Phase difference of one cycle of a wave in degrees and radians
360 degrees or 2(pie)radians
Anti phase difference (half a period) in degrees and radians
180 degrees and (pie) radians
Phase difference of a quarter cycle in degrees and radians
90 degrees and (pie)/2 radians
A bigger amplitude _____ the energy
Increases
A smaller amplitude _____ the amplitude
Decreases
The energy of a wave is calculated using gravitational potential energy which means that energy is directly proportional to the ______
(Amplitude)^2
Intensity written equation
I = power / area
I = P / 4(pie)r^2
inverse square applied to intensity
The wave intensity of a wave and the distance from the source follow an inverse square relationship
Admit-phase
Completely put of phase by 180 degrees
Example of a longitudinal wave
Sound waves
Example of transverse waves
Electromagnetic waves
Gamma rays - ( emitted by? Wavelength?)
~emitted by radioactive nuclei
~Range of wavelength < 10^-12
X- rays ( emitted by? Wavelength?)
~emitted by high speed electrons decelerating
~wavelength range 10^-8 to 10^-12
Ultra Violet ( emitted by? Wavelength?)
~emitted by electric arcs
~wavelength range (3*10^-7 to 10^-8)
Visible light wave length range
Red (8 * 10^-7)
Blue (3 * 10-7)
Infrared ( emitted by? Wavelength?)
~emitted by heat sources
~range (10^-3 to 10^-6)
Microwave ( emitted by? Wavelength?)
~ (1 to 10^-3)
Radio waves ( emitted by? Wavelength?)
~ 1 >
Can longitudinal waves be polarised?
No
Are radio waves polarised? If so why or why not?
Yes they are because transmitters oscillate vertically which produces a vertically
What affects the direction of a polarised wave?
The direction of polarisation of the wave is the orientation of the waves electric field
