At high noon, the Sun delivers 900 W to each square meter of a blacktop road. What is the equilibrium temperature of the asphalt, assuming its emissivity e = 1? (s = 5.67 × 10^-8 W/m2×K4)
a. 75°C
c. 91°C
b. 82°C
d. 99°C
B
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Which of the following statements about the celestial equator is true at all latitudes?
A) It lies along the band of light we call the Milky Way. B) It represents an extension of Earth's equator onto the celestial sphere. C) It cuts the dome of your sky exactly in half. D) It extends from your horizon due east, through your zenith, to your horizon due west. E) It extends from your horizon due north, through your zenith, to your horizon due south.
Refer to the sketch above of an H-R diagram for a star cluster. Consider the star to which the arrow points. How is it currently generating energy?
A) by gravitational contraction B) by hydrogen shell burning around an inert helium core C) by core hydrogen fusion D) by core helium fusion combined with hydrogen shell burning E) by both hydrogen and helium shell burning around an inert carbon core
Which part of the electromagnetic spectrum would we use to study the relatively cool dust of interstellar space?
A. visible light B. radio waves C. gamma rays D. ultraviolet light E. infrared light
What are the mass number and the atomic number for each of the following:
(a) beta+? (b) beta-?