Most Greek philosophers believed in a geocentric Universe
a. True
b. False
Indicate whether the statement is true or false
True
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The energy of a photon
a. is proportional to the wavelength of the light. b. is inversely proportional to the wavelength of the light. c. depends only on the speed of the light. d. depends only on the mass of the photon. e. depends on both the mass and speed of the photon.
Stars are evenly distributed throughout the Universe.
a. true b. false
Why do we sometimes observe asteroids at the distances of the gaps in the asteroid belt?
A) Jupiter's gravitational tugs keep them there. B) They are held in place by resonances with other asteroids. C) Actually, we never see asteroids in the gaps. D) They are kept in place by shepherding asteroids. E) A gap is located at an average orbital distance, and asteroid orbits often have large eccentricities.
Under electrostatic conditions, the electric field just outside the surface of any charged conductor
A) is always parallel to the surface. B) is always zero because the electric field is zero inside conductors. C) is always perpendicular to the surface of the conductor. D) is perpendicular to the surface of the conductor only if it is a sphere, a cylinder, or a flat sheet. E) can have nonzero components perpendicular to and parallel to the surface of the conductor.