The Sun is a slightly variable star. What if the surface temperature of the Sun were to increase from 6000 K to 6100 K, what would be the increase in total power radiated assuming no other changes such as radius or emissivity?
a. 1.6%
c. 3.4%
b. 6.8%
d. 14%
B
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If Earth's atmosphere had no greenhouse gases, then Earth's average surface temperature would be
A) well below the freezing point of water. B) about the same as it is now. C) slightly cooler, but still above freezing. D) slightly warmer, but still well below the boiling point of water.
The energy of a radio photon is ________ a photon in the visible part of the spectrum.
A. faster than B. higher than C. lower than D. longer than E. shorter than
A rocket in space fires its engines continuously until it runs out of fuel. Describe the motion of the rocket.
A. The rocket's speed is a constant value until the engines stop firing, and then coasts to a stop. B. The rocket's speed increases until its engines stop firing, and then coasts to a stop. C. The rocket does not move, as the engines have nothing to push against. D. The rocket's speed does not change, and it continues to move in a straight line. E. The rocket's speed increases until its engines stop firing, and then coasts in a straight line.
Eukaryotes
A) are made of two cells fused together B) are all unicellular C) can be unicellular or multicellular D) are all multicellular