The diagram shows a plot of the temperature of the sun as a function of distance above the bottom of the photosphere. At what distance above the bottom of the photosphere is the temperature of the sun the smallest?
a. 1000 km
b. 2300 km
c. 2500 km to 4000 km
d. 500 km
e. a and c
D
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The Doppler Effect is a phenomenon that allows one to measure an object's
A) temperature. B) radius. C) line-of-sight speed. D) chemical composition.
The length of the telescope is 1.60 m and it has a magnification of 60.0. What is the focal length of the objective?
A) 60.0 cm B) 157 cm C) 100 cm D) 128 cm E) 96.0 cm
Why do vapor bubbles get larger in boiling water as they approach the surface?
a. They only appear to get larger, this being a magnification effect due to looking through the water. b. The bubbles' pressure increases as they rise. c. The pressure in the water decreases as the bubble moves toward the surface. d. Bubbles always get bigger after they form.
Under what conditions will a converging (convex) lens produce a real image?