Wave Motion Flashcards
What are progressive waves?
Waves which energy is carried from one point to another by vibrations/oscillations
What are transverse waves?
Waves which displacement of particles are perpendicular to direction of transfer of energy
What are longitudinal waves?
Waves which displacement of particles are parallel to direction of transfer of energy
What is Displacement-Distance graph?
What can be found from this graph?
Snapshot of the graph at an instance in time (Many particles at one instance)
Wavelength, amplitude
What is Displacement-Time graph?
What can be found from this graph?
The journey of one particle over time (Displacement of one particle overtime)
Period/Frequency, amplitude
What is wavelength?
Shortest distance between any 2 successive points on a progressive wave which are vibrating in phase
Wave speed formula?
How to derrive?
V=fλ
Distance travlled over time (λ/T)
Hack for converting Displacement-Distance graph to Displacement-Time graph
Trace backwards of particle to find the type of graph
Finding phase difference for…
a) Displacement-Time graph
b) Displacement-Distance graph
What to note about phase difference?
a) △t/T x 2π
b) △x/λ x 2π
0 =/< Phase difference < 2π
Formula for intensity (Also can tell definition)
I = P/A
General expression for Intesity at distance r.
Relationship between intensity and radius
One thing to take note of
I = P/4πr^2
I ∝ 1/r^2
2D vs 3D
Formula for power received by receiver
Power received = Intesity x Area of receiver
Relationship between intensity and amplitude
I ∝ A^2
What is polarisation?
What to note about polarisation?
Oscillations of particles in wave only in one plane
Only transverse waves can be polarised.
General formula for amplitude after passing through polariser
One thing to take note of
A = A0cosθ
For more than one polariser, rmb the angle changes.
