When you look through a sheer curtain at a distant street lamp, you see a pattern of colored spots of light. This occurs by
a. polarization of light in scattering and partial absorption by the threads.
b. interference of light waves that pass through the threads with light waves that pass through the openings between the threads.
c. refraction of light waves differentially in the cylindrical threads.
d. diffraction of light waves passing through the two dimensional pattern of openings between the threads.
e. reflection of light waves by the sides of the threads.
d
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If we could see our own galaxy from 2 million light-years away, it would appear
A) as a flattened disk with a central bulge and spiral arms, spanning a few degrees across the sky. B) as a faintly glowing band of light stretching all the way around the sky. C) to fill the sky with widely spaced stars. D) like a single, dim star.
Observer A is 3.0 m from a tiny light bulb and observer B is 12.0 m from the same bulb. Assume that the light spreads out uniformly and undergoes no significant reflections or absorption
If observer B sees a light of intensity I, the light intensity that A sees is A) I. B) 9I. C) 16I. D) 36I. E) 144I.
Which of the following is not a product of outgassing?
A) water B) nitrogen C) oxygen D) carbon dioxide E) sulfur dioxide
A block is pushed across a rough horizontal surface from point A to point B by a force (magnitude P = 5.4 N) as shown in the figure. The magnitude of the force of friction acting on the block between A and B is 1.2 N and points A and B are 0.5 m apart. If the kinetic energies of the block at A and B are 4.0 J and 5.6 J, respectively, how much work is done on the block by the force
P between A and B?
a.
2.7 J
b.
1.0 J
c.
2.2 J
d.
1.6 J
e.
3.2 J