What is one atomic mass unit?
a. The mass of a hydrogen atom at the Earth's surface.
b. The mass of an oxygen atom in outer space.
c. The mass of a carbon atom.
d. One-twelfth of a carbon atom.
e. One-twentieth the mass of a uranium atom.
d
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Analog sound signals are produced by
A) phonograph records. B) CDs. C) DVDs. D) all of the above E) none of the above
A 20 solar mass star will stay on the main sequence for 10 million years, yet its iron core can exist for only a
A) day. B) week. C) month. D) year. E) century.
Extrasolar planets have been discovered with average densities similar to
A) styrofoam. B) iron. C) water. D) all of the above E) none of the above
Explain why an absorption line spectrum is not filled back in (to make the original continuous spectrum) by the photons that are emitted as the excited electrons decay back down to their original energy levels
What will be an ideal response?