A Doppler red shift indicates
a. a shift toward higher frequencies.
b. a shift toward longer wavelengths.
c. that a light source is approaching relative to the observer.
d. none of these.
Answer: d. none of these.
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A form of precipitation that results from convection cycles in clouds is
a. sleet. b. rain. c. hail. d. fog.
The increase of atmospheric CO2 levels to 400 ppm has tipped Earth's natural greenhouse effect toward global warming. The rise of CO2 is due to
A) human activity—the burning of fossil fuels (coal, oil, and gas) and deforestation. B) human activity—overpopulation and increased reliance on solar energy. C) human negligence—efforts of not recycling waste materials for potential reuse. D) the industrial revolution and increased cloud cover.
The hotter an object, the more blue it appears
Indicate whether the statement is true or false
Which of the following best explains why an interstellar ramjet could, in theory, achieve continuous acceleration?
A) It uses fuel that is more efficient than any other known fuel. B) It collects its fuel as it goes, rather than having to carry the weight of fuel along with it. C) It takes advantage of theoretically possible loopholes in Einstein's theory of relativity. D) It has such a large fuel tank that it will essentially never use up all the fuel it carries. E) Its speed always gets faster because time dilation changes the rate at which time flows.