Using the approximate formula for the Doppler shift, 
one finds that a source is moving away at 0.60 c. What result would the exact formula yield for the recession speed?
A. 0.84 c
B. 0.72 c
C. 0.60 c
D. 0.54 c
E. 0.40 c
B. 0.72 c
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A thin electronic circuit board, 0.1 m by 0.1 m in size, is to be cooled in air at 25°C. The board is placed in a vertical position and the back side is well insulated. If the heat dissipation is uniform at 200 W/m2, determine the average temperature of the surface of the board cover.
GIVEN
• Vertical circuit board in air
• Back is well insulated
• Board dimensions (L × H) = 0.1 m × 0.1 m
• Air temperature (T ?) = 25°C
• Uniform heat dissipation rate ( q G/A) = 200 W/m2
FIND
• The average temperature of the surface of the board (Ts)
ASSUMPTIONS
• Ambient air is still
• The board has reached steady state
• Radiation is negligible
SKETCH
Add and and express your answer in milligrams (mg)
A) 7.05 × 107 mg B) 7.05 × 104 mg C) 7.05 × 105 mg D) 7.05 × 106 mg
The discovery of extremophiles on Earth suggests that
A) life elsewhere will only be found under conditions that are similar to those of Earth B) life elsewhere will only be possible over a much narrower range of conditions than initially thought C) life elsewhere may be possible over a much wider range of conditions than initially thought D) extraterrestrial life will exist only under extreme conditions
What is coherent light?
a. light of a single wavelength b. light that is all in phase c. light that is polarized in one direction d. none of the above