Where does most of Earth's 14C come from?
A) It was deposited on Earth when the solar system first evolved.
B) It is continually being formed by the impact of cosmic rays on the atmosphere.
C) It is continually being formed as a result of the photosynthesis process
D) It comes to Earth from outer space along with other cosmic rays.
E) It was deposited on Earth many years ago by meteors.
B
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The Hipparcos mission's observations have given us good data on stars out to about:
A) 100 light years. B) 200 light years. C) 200 parsecs. D) 1000 light years. E) 1000 parsecs.
Life emerged on Earth about a billion years after the solar system formed
Indicate whether the statement is true or false
A Carnot air conditioner has a coefficient of performance of 17.0 and removes 72.0 MJ of heat from the interior of a house every hour. How much power does it consume?
A) 1180 W B) 1320 W C) 520 kW D) 3.14 MW E) 1.25 MW
Two stars, A and B, have the same emissivity, but the radii and surface temperatures are different with RA = 2 RB, and TA = 0.5 TB. Assuming the temperature of space to be negligible, which star radiates the most energy per unit time?
a. Star A b. Star B c. Both radiate the same amount of energy per unit time. d. More information is needed in order to make a determination.