Waves 4.4.1 To 4.4.2 Flashcards
What is phase difference
How in sync two points on a wave are
What is period
the time it takes for one complete pattern of oscillation
what is the frequency
the number of oscillations per unit time
what is a wave length
the distance between two successive identical points on a wave
what is the displacement
on a wave
the distance any part of the wave has moved from its mean
what is the amplitude
the maximum displacement
what is antiphase
half a wave cycle
how to calculate the radian
degrees/180 x π
how to get radian to angle in degrees
radian/π x180
what is the equation for frequency
F= 1/Time period (T)
how to work out the time period on oscilloscope
time period= distance between peaks x time base
equation for intensity
intensity = power / area (surface area)
how to work out surface area for circle
4πr^2
Believe and you will
ᕙ(`▿´)ᕗ
what is the units for period
s (seconds)
what is the unit for wavelength
m (meters)
what is the unit for frequency
Hz (Hertz)
what is the unit for phase difference
radian/rad
what is 360 degrees in radian/ rad and what is the wavelength
2π
(one) λ
what is 180 degrees in radian/ rad and what is the wavelength
π
1/2 λ wavelength
what is 90 degrees in rad and what is the wavelength
1/2π for radian
1/4 λ wavelength
what is 45 degrees in rad and what is the wavelength
1/4π
1/8 λ
what is a mechanical wave
a wave that moves around a fixed point
what is a progressive wave
an oscillation that transfers energy and information
the higher the amplitude…
the greater the intensity
intensity is proportional to…
amplitude^2
What is diffraction
The spreading of a wave after passing around an obstacle or through a gap
When does minimum diffraction occur
When the gap size is far smaller/ larger than the wavelength
What is the principal of super position
When two or more waves meet the total displacement is the sun of displacements that each wave would’ve caused
What is phase
The measurement of position of a certain point along the wave cycle
What is the equation for intensity
Intensity= power /area
What fields make up electromagnetic waves
Vibrating electric fields and magnetic fields
Name the em spectrum
Radio waves
Microwaves
Infrared radiation
Ultra violet
X-rays
Gamma rays
What is plane polarisation
The plane in which a wave vibration
What is the principle of superposition
Resultant displacement is equal to the sum of the individual displacements
When a wave bends towards the normal it’s….
Slowing down and going from a less optically dense medium to a more optically dense medium
When a wave bends away from the normal it’s…
Speeding up and going from an optically denser medium to a less optically dense
What is refraction
The way a wave changes direction when entering a different medium
constructive interference occurs when
(nλ) n is integer
destructive interference occurs when
(n+1/2)λ
tell me malus’ law
Malus’ law states that when a perfect polariser is put in a beam of polarised light, the intensity of the light that passes through it is
given by I= Io Cos^2θ
wavelength of light equation young double slit
λ=ax/D
a = slit separation
x= distance between fringes
D= distance between slits and screen
grating equation for wavelength
nλ =dsinθ
n=order number
d= slit seperation
θ= angle between 0th and nth fringe
What is meant by a plane polarised wave (2)
-Oscillations are in one direction only
- perpendicular to the direction or wave propagation
