As Waves Flashcards
What is the equation for the refractive index of light??
c\v = n
What is maulus law? And the two sub laws
A= Ao Cos©
I proportional A^2
Maulus law
I=I^2 Cos^2©
What is the equation of the Doppler effect including f, v and c
V/C = ∆f/f = ∆✓/✓
✓ is wavelength
The equation of the ratio of Doppler effect?
Z= V/C
What is C in the the Doppler effect?
The speed of the wave
What is Snell’s law??
Sini / Sinr. = n
Which direction does a wave bend if it slows down?
If it slows down, it goes towards the normal
What is n, I’m terms of speed?
Speed 1 / speed 2 = n
Where 1 is the initial
At what angle will light be internally retracted
At the critical angle
What remains constant throughout retraction
The frequency
What remains constant throughout retraction
Frequency
When do you get construction path difference?
When the multiple of the wavelength is
n✓
When do you get deconstructive path difference?
When the multiple is n/2 ✓
To be coherent what must be the same?
They must have the same wavelength thus colour of lightt
What is the principle of superposition?
States that when two waves meet at a point the resultant displacement at that point is equal to the sum of displacements of the individual waves.
What is the difference between path and phase difference?
Path is the difference in distance- a Length
Phase is a a measurement in degrees or radians
What is the refraction law?
n1 sin©1 = n2 sin©2
The equation for critical angle?
Sin C = 1/n
Properties of EM waves?
Can travel through a vacuum
Travel at C
Are transverse
Made up of electromagnetic and electrical
What is frequency?
The number of wavelengths passing through a point per unit time
Which direction does the energy travel in a longitudinal wave?
In the direction of motion
What is diffraction?
Is the spreading of a wave when it passing through a narrow gap.
The SPEED, WAVELENGTH and FREQUENCY, do not change
There is significant diffraction when the width is similar to the wavelength of the wave
( why can be heard through doors)
What is a in the YDS experiment and how would you measure it
The fringe separation, using a travelling microscope
How did Young produce coherent light?
He either put a colour filter or he added a single slit before the double ones
What is the other equation for YDS experiment?
d sin©=n✓
Why does white light split up??
Because of sin© proportional to the wavelength
So the bigger the angle the longer the wavelength
What is the velocity of the wave equal?
V= √T/Ù. Ù= mass/ length
What is the wavelength better two NODES?
1/2✓
What is the wavelength of a Antinode and node?
1/4 ✓
What does the fundamental frequency mean?
The lowest frequency of virbration per arrangement
Is the length of the string is L, what’s the length of the wavelength if you know the fundamental frequency?
2L
What do all the lettes mean?
d sin© = n✓
n= the order (0th is the middle) ✓= wavelength d = the distance between slits
