Star A has the peak of its blackbody radiation at ?A. Star B has its peak at ?B, which is one-third that of ?A. If Star A's surface temperature is TA, how does the surface temperature TB of Star B compare?
a. TB = TA/9 b. TB = 3TA
c. TB = 9 TA d. TB = TA/3
b
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Which of the following statements about the moons of the jovian planets is true?
A) Most of the moons have the potato-like shapes of asteroids, but a few are large enough to be spherical in shape. B) Even the biggest moons are smaller than any of the planets or dwarf planets in our solar system. C) All of the moons are barren and essentially airless, like our own Moon. D) The moons are made almost entirely of rock and metal.
An ancient rock is found to contain 40Ar gas, indicating that 77% of the 40K in the rock has decayed since the rock solidified. Any argon would have boiled out of liquid rock. The half-life of 40K is 1.25 billion years
How long ago did the rock solidify? A) 2.6 billion years B) 0.50 billion years C) 1.8 billion years D) 0.30 billion years
____________________ appear reddish in color due to the light emitted by the Balmer series of the hydrogen atom
Fill in the blank(s) with correct word