Of photons of red, yellow, light, and blue light, which photons have the least energy?
a. red
c. green
b. blue
d. yellow
A
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Compare the frictional pressure drop due to the vapor flow to that due to the liquid flow through the wick for a heat pipe using ammonia as the working fluid. Assume that the ratio of dynamic viscosities of ammonia is µI/µV = 3.0, the inside diameter of the wick is 2 cm and the annular area of the wick is 0.65 cm^2. The wick is phosphor-bronze.
What will be an ideal response?
The search for Earth-like extraterrestrial life is essentially a search for
A) energy B) liquid water C) oxygen D) carbon
Which of the following explains why, about 13,000 years from now, Vega will be a better North Star than Polaris?
A) Earth rotates once each day. B) Earth orbits the Sun once each year. C) The direction of Earth's axis in space precesses with a period of about 26,000 years. D) Stars appear to move randomly relative to our Sun in the local solar neighborhood. E) The universe is expanding.
All of the following criteria define a mineral except:
-It is organic. -It is naturally occurring. -It has a well-defined chemical composition. -It is inorganic. -It has an orderly internal structure.