The two most abundant elements in the sun are
a. nitrogen and oxygen.
b. hydrogen and helium.
c. sulfur and iron.
d. carbon and hydrogen.
e. carbon and nitrogen.
B
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In atomic absorption chromatography, the amount of light absorbed is ________ to the concentration of the element in the test sample.
A) is not related B) indirectly related C) directly related
Standing Sound Waves: In a resonating pipe that is open at both ends, there
A. are displacement nodes at each end. B. are displacement antinodes at each end. C. is a displacement node at one end and a displacement antinode at the other end. D. None of these choices are correct.
Why are astronauts weightless in the Space Station? You may find it helpful to watch the video "Newton's Laws of Motion."
A) because the Space Station is constantly in free-fall around the Earth B) because the Space Station is traveling so fast C) because there is no gravity in space D) because the Space Station is moving at constant velocity
The analysis of Martian meteorites found on the Earth show that they contain
A) only tantalizing hints of possible life. B) fossilized remains of multi-cellular insects. C) fossilized remains of small, mammal-like creatures. D) bacteria with DNA very different from bacteria on Earth. E) bacteria with DNA closely related to bacteria on Earth.