If a fossil were to be discovered which was 3.7 billion years old this would tell us that life on Earth must have arisen
A) exactly 3.7 billion years ago
B) at least 3.7 billion years ago
C) less than 3.7 billion years ago
D) much later than 3.7 billion years ago
B
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The atmosphere of Mars primarily consists of ____________________
Fill in the blank(s) with correct word
If a monkey floating in outer space throws his hat away, the hat and the monkey will both
A) move away from each other, but at different speeds. B) move away from each other at the same speed. C) move a short distance and then slow down. D) move a short distance and then go faster. E) come to a stop after a few minutes.
The radioactivity due to Carbon-14 measured in a piece of a wooden casket from an ancient burial site was found to produce 20.0 counts per minute from a given sample,
whereas the same amount of carbon from a piece of living wood produced 160. counts per minute. The half-life of Carbon-14, a beta emitter, is 5730. years. Thus we would estimate the age of the artifact to be about A) 14,800 years B) 20,000 years C) 5,700 years D) 17,200 years E) 11,500 years
A metallic sheet has a large number of slits, 5.0 mm wide and 20 cm apart, and is used as a diffraction grating for microwaves
A wide parallel beam of microwaves is incident normally on the sheet. If the microwave wavelength is 6.0 cm, what is the largest angle away from the central maximum at which an intensity maximum occurs. A) 74° B) 64° C) 79° D) 69° E) 84°