9.. Sound waves do not exhibit polarization because, unlike light waves, they are not
(A)Longitudinal
(B)Coherent
(C)Dispersive
(D)Transverse
(E)Refractive
10.. The solar glare of sunlight bouncing off water or snow can be a real problem for
drivers. The reflecting sunlight is horizontally polarized, meaning that the light waves
oscillate at an angle of 90º to a normal line drawn perpendicular to the Earth. At what
angle relative to this normal line should sunglasses be polarized if they are to be
effective against solar glare?
(A)0º
(B)30º
(C)45º
(D)60º
(E)90º
Explanations
- C
Gamma rays have wavelengths shorter than m. Don’t confuse wavelength and frequency: gamma
waves have a very high frequency, thus they have a short wavelength.
- C
Wavelength and frequency are related by the formula. In the case of light, m/s,
so we can solve for f with the following calculations:
- A
When the wave enters the glass, its frequency does not change; otherwise, its color would change. However,
the wave moves at a different speed, since the speed of light, v, in different substances is given by the