The Kelvin form of the second law of thermodynamics states that
A. an engine can take heat from a single reservoir and convert it all to work
B. no engine can take heat from a single reservoir and convert it all to work
C. an engine can have a greater efficiency than a
Carnot engine
B. no engine can take heat from a single reservoir and convert it all to work
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Reducing the lens aperture size is a scheme one can use to reduce the occurrence of which of the following effects?
a. spherical aberration b. mirages c. chromatic aberration d. light scattering
Why can't we see past the cosmological horizon?
A) Beyond the cosmological horizon, we would be looking back to a time before the universe was born. B) We do not have big enough telescopes. C) The cosmological horizon is infinitely far away, and we can't see to infinity. D) Every galaxy in the entire universe (not just the observable universe) exists within the cosmological horizon, so there's nothing to see beyond it.
What are the Kirkwood Gaps? What role does Jupiter play?
What will be an ideal response?
A small source radiates an electromagnetic wave with a single frequency into vacuum, equally in all directions. As the wave moves, its intensity:
1.increases. 2.decreases. 3.stays constant.