Wave Properties Flashcards
What is the principle of superposition?
When 2/more waves (of the same type) occupy the same position in space then the resultant wave is found by the vector sum of the individual displacements of the waves at any point
wtf
What’s constructive interference?
(must be same type of wave)
2 waves in-phase adding together ig?
What’s destructive interference?
(must also be same type of wave)
2 waves out-of-phase adding together ig?
What’s total destructive interference?
Well after the 2 out-of-phase waves add, the resultant wave is zero aka cancellation
Honestly the hard part talking bout here is just the stationary wave type shits,
I’d be perhaps good talking bout them slits n stuff
U right
What are the 2 things known in a stationary wave?
- Nodes
- Antinodes
Explain nodes
Places along wave w/ zero displacement
Destructive interference
Explain antinodes
Places between nodes that oscillate & suffer maximum displacement
- range of (maximum) constructive and destructive interference occur here
Formula for distance between adjacent nodes/adjacent antinodes?
Inter-nodal spacing is λ/2
Look in phone for difference between stationary wave and progressive wave
Okay
and also look in phone for them damn string, closed and open pipe harmonic type shi
Yup…
What is diffraction of a wave?
The spreading out of a wave’s energy around obstacles and through gaps
For a diffraction thru gap, what happens when gap width decreases?
If gap width decreases, amount of diffraction (angle of spread) increases
When does maximum diffraction occur?
Gap width equal/slightly smaller than λ
Explain coherent sources during 2 source interference
- Coherent when they produces waves of same freq
- Same amplitude and maintain constant phase difference
Explain incoherent wave sources during 2 source interference
- 2 sources of waves having different frequencies
-Will have phases constantly changing - Therefore pattern produces constantly changing
2 examples of incoherent wave sources?
- Sunlight
- Light bulbs
Formula for interference fringe separation formula?
λ = (a△y)/D
Explain each symbol within interference fringe separation formula
(all must be in m units)
λ = (a△y)/D
λ - wavelength (m)
a - source separation (m)
D - distance from source (m)
△y - fringe separation (m)
In a double slit experiment, explain the bright fringes seen
- Constructive intereference
- Between 2 beams coming from both slits
- Must be arriving in-phase
In a double slit experiment, explain the dark fringes seen
- Destructive interference
- Between 2 beams coming from both slits
- Must be arriving out-of-phase
How to make double slit method more accurate?
Add more slits….
3 advantages of using diffraction grating?
- More light can pass thru = fringes r brighter
- Fringes more well-defined, better cancellation either side of centre of fringe
- Fringes more spread out due to much smaller slit separation
What is meant by monochromatic light?
single-wavelength light
What is the formula for diffraction grating?
nλ = dsinθ
Explain each symbol within formula of diffraction grating
(units gotta be m mostly)
nλ = dsinθ
n - order number
λ - wavelength (m)
d - slit separation (m)
θ - angular position of order from centre (degrees)
Go do some questions, idk if i can, can i? Am cooked
He’s cooked
