Week 11: Light 373
- Polaroid Sunglasses:
Reflected glare from any smooth surface and scattered glare at midday are both
likely to be at least partially polarizedparallel to the ground. Both are thus blocked
by a pair of polaroid sunglasses with avertical transmission axis. - Doppler Shift, Moving Source:
In a non-relativistic setting (vs≪c):
f′=
( f
1 ∓vcs) (914)
for an approaching (-) or receding (+) source describes the general moving source
doppler shift in the frequency/color detected by the receiver.- Doppler Shift, Moving Receiver:
Again in a non-relativistic setting (vr≪c):
f′=f(1±vr
c) (915)
for a receiver moving towards (+) or away from (-) the source.- Moving Source and Moving Receiver:
Ditto:
f′=f
(1±vcr)
(1∓vcs)(916)
- Cerenkov Radiation:
The ”light boom” given off by a charged particle moving faster than the speed of
lightin a mediumis calledCerenkov radiation.