What do we mean by dimension in the context of relativity?
A) the size of an object
B) the number of independent directions in which movement is possible
C) the letter used to represent length mathematically
D) the number of sides that we can see when we look at an object
E) the height of an object
B
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Unpolarized light is passed through three successive Polaroid filters, each with its transmission axis at 45.0° to the preceding filter. What percentage of light gets through?
a. 0% b. 12.5% c. 25.0% d. 50.0% e. 33.3%
A 120-m long copper wire (resistivity 1.68 × 10-8 ??m) has resistance 6.0 ?. What is the diameter of the wire?
A) 0.065 mm B) 0.65 mm C) 0.65 cm D) 0.65 m E) 6.5 m
What happens to the visible light radiated by stars located within a dusty gas cloud?
A) It is blocked by dust and its energy is thereby lost. B) It is absorbed by dust, which heats the dust grains so that they emit the absorbed energy as infrared light. C) It is reflected by dust back to the star from whence it came. D) It passes through the cloud unaffected.
A moon with a smooth, uncratered surface would imply
A) the surface is completely liquid. B) the surface is very young. C) meteorites have never struck the moon. D) the moon lies within the planet's Roche Limit. E) a strong magnetic field surrounds the moon.