Beyond the formation of iron, nuclear energy can be produced only by:
A) fusion of still heavier elements.
B) ionization of the radioactive nuclei.
C) fission of heavy nuclei back toward lighter ones.
D) gravity.
E) the dark force.
C
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Why is the claim of the discovery of microfossils controversial?
A) they are found in rocks from the Hadean Eon B) it is not clear whether they are of biological or mineral origin C) the rocks they are found in are probably contaminated by terrestrial bacteria D) they are too small to be of biological origin
Why do Earth rocks have much younger ages than most meteorites?
A) Earth formed billions of years after most meteorites formed. B) The rocks solidified long after the formation of the solar nebula. C) The atoms that make up Earth rocks are generally younger than the atoms that make up meteorites. D) Most meteorites come from other planetary systems that formed before our solar system.
The distance of the Earth from the Sun is 93 000 000 miles. If there are 3.15 × 10^7 s in one year, find the speed of the Earth in its orbit about the Sun
a. 9.28 miles/s b. 18.6 miles/s c. 27.9 miles/s d. 37.2 miles/s
In the Drude model of electrical conduction, the current density is directly proportional to
a. the average time interval between successive collisions. b. the number of charge carriers per unit volume. c. the square of the electron charge. d. the electric field present in the wire. e. the product of all four quantities listed above.