Seismic data indicates that there is a relatively thin outer layer of Earth called the
a) outer core.
b) asthenosphere.
c) mantle.
d) crust.
d
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Suppose you drop a clock toward a black hole. As you look at the clock from a high orbit, what will you notice?
A) Time on the clock will run slower as it approaches the black hole, and light from the clock will be increasingly redshifted. B) Time on the clock will run faster as it approaches the black hole, and light from the clock will be increasingly blueshifted. C) The clock will fall toward the black hole at a steady rate, so that you'll see it plunge through the event horizon within just a few minutes. D) The clock will fall faster and faster, reaching the speed of light as it crosses the event horizon.
Doubling the diameter of a loop of wire produces what change of induced emf?
A. The induced emf is 4 times as much. B. The induced emf is twice as much. C. There is no change in the induced emf. D. The induced emf is 6.28 times as much.
If you could convert the entire mass of the Sun (mass 2 x 1033g) into pure energy, how much energy would be produced (in ergs) ? The speed of light c = 3 x 1010cm/s.
A. 2 x 1033ergs B. 1.8 x 1054ergs C. 6 x 10133ergs D. 1 x 1051ergs E. 6 x 1043ergs
In a ruby laser, an electron jumps from a higher energy level to a lower one
If the energy difference between the two levels is 1.8 eV, what is the wavelength of the emitted photon? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 350 nm B) 470 nm C) 650 nm D) 690 nm E) 960 nm