Liquid Crystal Displays (LCDs) depend upon which of the following for their operation?
A) coherence
B) polarization
C) diffraction
D) dichroism
E) thin film interference
B
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Explain how the shifting spectral lines of spectroscopic binaries let us find their periods
What will be an ideal response?
According to Einstein, gravity is not the force exerted by one object on another, but rather the
A) effect we witness when a large mass causes a curvature in the shape of spacetime. B) force of attraction that exists between two objects. C) effects of the graviton particle. D) curvature of space caused by objects reaching the speed of light.
What are giant molecular clouds?
a. Cocoons of dust around young protostars, containing giant molecules such as C3H8 and C6H12O6
b. Dark interstellar globules of up to about 30 light-years across and containing a few thousand solar masses of material
c. Bright clouds up to about 100 light-years across surrounding hot, young stars, and glowing with reddish H? emission
d. Star-formation regions of up to about 300 light-years across and containing about a million solar masses of material
The minimum current that will usually kill the average person is
A) 10. A. B) 0.1 A. C) 1. A. D) 0.01 A. E) 0.1 mA.