polarisation Flashcards
1
Q
what is the difference between oscillation and vibration
A
oscillation of particles do not need matter to move
2
Q
unpolarised light
A
- light that is always perpendicular to the direction of energy transferred
- the direction of oscillation changes continuously and randomly
3
Q
transmission axis
A
the direction at which light is let through
4
Q
polarisation
A
restricting the oscillations of transverse waves to one plane
5
Q
plane-polarised light
A
- a light wave that oscillates in one direction after passing through a polarising filter
- only a transverse wave can be polarised
6
Q
uses of polarisers
A
- sunglasses
- LCD displays
- cameras (to reduce glare and enhance images)
7
Q
why is no light shown when one polariser is rotated 90 degrees in front of another
A
- the transmission axis of each polariser are perpendicular to each other (they do not align)
- so light waves is not let through the second polariser
8
Q
emission spectrum
A
- when electrons drop to lower shells to emit light
- heating up solids give a continuous spectrum
9
Q
absorption spectrum
A
- when electrons jump to higher shells and absorb light
- heating up a gas gives a discrete emission spectrum
10
Q
why will an electron not move to a different shell if the energy applied is higher than the required amount
A
- the energy must be specific to its electron shells, more or less and the electron will not move
- electron shells requires specific amounts of energy
11
Q
electron volt
A
unit of energy transferred when an electron goes through one volt
