For a pair of Polaroids with axes at 45 degrees to each other
A) light will not pass.
B) light that passes is dimmer than for a parallel orientation.
C) another Polaroid is necessary for any light to pass.
Answer: B
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One experiment that informs us that gravity bends lightbeams is
A) the bending of starlight as it nears Earth. B) experiments in which laser beams are shined onto the surface of the moon, and their bending is measured. C) the observed bending of light from stars as the light passes the sun. D) the observed bending of sunlight in Earth's gravitational field. E) laboratory experiments in which laser beams pass by massive amounts of iron.
The index of refraction of a substance is
a)equal to the speed of light in vacuum divided by its speed in that substance. b)equal to the speed of light in that substance. c)the same as the angle of refraction. d)the same as the angle of incidence. ? ? ?
The silver lining on the glass surfaces of a Thermos bottle reduces energy that is transferred by
A) conduction. B) convection. C) radiation. D) friction. E) none of the above
A laser is thrown upward with a speed of 12 m/s on the surface of planet X where the acceleration due to gravity is 1.5 m/s2 and there is no atmosphere. How long does it take for the laser to reach the maximum height?
A) 8.0 s B) 11 s C) 14 s D) 16 s