Only high-energy gamma rays can escape the event horizon of a black hole
Indicate whether the statement is true or false
FALSE
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The terrestrial planet with the oldest surface is ____________________
Fill in the blank(s) with correct word
Resistance and Resistivity: A wire of resistivity ? must be replaced in a circuit by a wire of the same material but four times as long. If, however, the total resistance is to remain as before, the diameter of the new wire must
A. be the same as the original diameter. B. be one-half the original diameter. C. be one-fourth the original diameter. D. be two times the original diameter. E. be four times the original diameter.
In the proton-proton cycle, the eventual product is
a. heavy hydrogen. b. tritium. c. helium-3. d. helium-4.
The two elements silicon and oxygen, taken together, make up about what percent of Earth's crust by mass?
a. 25% b. 64% c. 50% d. 75%