The process of scattering of light by a molecule (rayleigh scattering) is an important physical phenomenon. instead of thinking of scattering as light simply bouncing off the molecule, one should think of it as an absorption followed by reradiation of light.
the probability for light to be scattered is proportional to the inverse of the wavelength to the fourth power, (1/λ^4). this means that the shorter wavelengths (toward blue) get scattered more strongly than the longer wavelengths (toward red).
rayleigh scattering can explain why the daytime sky looks blue, the sunset looks red, and clouds are white. in the afternoon you observe mostly scattered light (blue); in the evening you see mostly transmitted light (red). the clouds have higher concentration of water and ice droplets. this means that light gets rescattered many times and all wavelengths get a chance to scatter out of the clouds, adding up to white light.
another effect that can be explained by light scattering is polarization. when you look at the sky with polaroid sunglasses it appears darker or brighter from different angles. this is because the scattered light is partially polarized. the white light scattered from the clouds is unpolarized, because the light scatters randomly, multiple times. the direction of its polarization becomes random and thus the light is unpolarized. this effect can be useful for making dramatic photographs of the sky.
consider a photographer who wants to take a picture of an interesting cloud formation. to increase the ratio of the clouds' intensity to that of the blue sky the photographer uses a polarizing filter.
find the angle ϕ between the filter's polarizing axis and the direction of polarization of light necessary to increase the ratio of the clouds' intensity to that of the blue sky so that it is three times the normal value.
express your answer in degrees to four significant figures.
Answers: 3
Physics, 22.06.2019 00:50, Amandarobersonn
While goofing off at the ice skating rink, a student takes off her shoes and places each of them on the ice. her friend, a hockey player, then shoots a hockey puck at each shoe. the first puck immediately comes to rest after it collides with the left shoe. the second puck rebounds after it collides with the right shoe. if each hockey puck has the same incoming speed, which shoe has greater speed after the collision? the right shoe. both shoes have the same speed. the left shoe.
Answers: 3
Physics, 22.06.2019 05:30, xaviiaquino3378
Choose the most likely outcome of this scenario: jen decided to go bike riding without a helmet. while no one is around during her ride, she is thrown from her bike when her wheel goes into a pothole. she is not injured, but she is terrified to get back on her bike. what happens next? a. her physical health is affected even though she wasn't hurt. b. her mental and emotional health are affected because she is afraid to get back on her bike. c. her social health is affected because she is worried her friends saw the fall. d. her overall health is not affected at all by her fall.
Answers: 1
Physics, 22.06.2019 18:00, hannacarroll2539
Athin nonconducting rod with a uniform distribution of positive charge q is bent into a circle of radius r. the central perpendicular axis through the ring is a z-axis, with the origin at the center of the ring. a) what is the magnitude of the electric field due to the rod at z = 0? n/c (b) what is the magnitude of the electric field due to the rod at z = infinity? n/c (c) in terms of r, at what positive value of z is that magnitude maximum? r (d) if r = 4.00 cm and q = 9.00 µc, what is the maximum magnitude? n/c
Answers: 1
The process of scattering of light by a molecule (rayleigh scattering) is an important physical phen...
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