When the tiny hole in a pinhole camera is made larger, the image is
A) brighter but less clear.
B) clearer.
C) right-side up.
D) none of the above
Answer: A
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Which of the following formed elements has a nucleus?
a) Platelet b) Red blood cell c) White blood cell d) A and B e) All of the above
What did the cosmic microwave background tell cosmologists about the early universe?
A) Nothing; it is a product of the black hole in the center of our own Galaxy. B) The horizon problem, in that the microwave background is almost too isotropic C) The discovery of dark energy and its role in accelerating the universe D) The discovery of relativistic redshifts and the Big Bang E) The dark matter in the universe is mostly baryonic in nature, for a closed Big Bang.
What is gravitational lensing? According to general relativity, why does it occur?
What will be an ideal response?
Two long parallel wires placed side-by-side on a horizontal table carry identical size currents in opposite directions. The wire on your right carries current toward you, and the wire on your left carries current away from you
From your point of view, the magnetic field at the point exactly midway between the two wires A) points upward. B) points downward. C) points toward you. D) points away from you. E) is zero.