A spherical surface surrounds a point charge it its center. If the charge is doubled and if the radius of the surface is also doubled, what happens to the electric flux ?E out of the surface and the magnitude E of the electric field at the surface as a result of these doublings?
a. ?E and E do not change.
b. ?E increases and E remains the same.
c. ?E increases and E decreases.
d. ?E increases and E increases.
c
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In the unified model of active galactic nuclei, the broad line region in an active galactic nucleus is
a. composed of clouds of gas and stars moving at very high orbital velocities near a supermassive black hole. b. composed of a super massive black hole surrounded with empty space c. responsible for producing the bright continuous radiation from within the event horizon. d. responsible for the narrow absorption lines seen in Type 2 Seyfert galaxies. e. located far from the core beyond the disk of stars of the galaxy
The mathematical model of quantum mechanics was principally founded by
a. Max Planck. b. Albert Einstein. c. Neils Bohr. d. Erwin Schrödinger. e. Werner Heisenberg.
Consider an electromagnetic wave traveling in the positive y direction. The magnetic field associated with the wave at some location at some instant points in the negative x direction as shown in Figure OQ34.11. What is the direction of the electric field at this position and at this instant?
What evidence suggests that life was common on Earth within a billion years of its formation?
A) Life must have formed early in order to produce the variety of lifeforms seen today. B) rocks older than 3.85 billion years with the carbon-12 to carbon-13 ratio typical of living organisms C) 3.5 billion year old rock structures formed by microbes called stromatolites D) A and C E) B and C