The solar radiation curve is a graph of
A) colors of sunlight versus their frequencies.
B) colors of sunlight versus their wavelengths.
C) the path of the Sun about Earth.
D) brightness versus frequency.
E) intensity versus distance from the Sun.
Answer: D
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When Eratosthenes was using the well at Syene and the obelisk at Alexandria to study the Earth, what statistic was he trying to calculate?
Binary (double) stars can be detected by
a. being seen as two separate stars with a telescope. b. one star traveling a wiggly proper-motion path across the sky. c. one star dimming abruptly as another passes in front of it. d. pairs of absorption lines seen in the spectrum of what appears to be one star. e. All of the other choices are correct.
Gamma-ray telescopes, such as the Fermi Gamma Ray Space Telescope, are launched into space because they are dangerous to operate on Earth.
Answer the following statement true (T) or false (F)
Electric potential is measured in units of
A) volts. B) joules. C) amperes. D) watts. E) any or all of these