What is meant by a line spectrum?
a. a spectrum which is straight
b. a spectrum made of bright lines in certain places, separated by dark gaps
c. a spectrum made by a hot filament stretched into a straight line
d. none of the above
B
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For a material that has no applied fields, the major contribution to the potential energy is the energy of chemical _____________.
Fill in the blank(s) with the appropriate word(s).
The most likely first form of life on Earth was probably an archaea-like extremophile tolerant of high temperatures
a. True b. False Indicate whether the statement is true or false
Cold-dark-matter models predict:
A) large-scale filaments containing both normal matter and dark matter. B) no structure on a smaller scale than superclusters. C) the universe is less than 10 billion years old. D) dense regions of the early universe that led to galaxies formed after decoupling. E) that dark matter is the largest component of the universe's density.
For a temperature of –40°F, what are the corresponding temperatures on the
a. Celsius scale? b. Kelvin scale?