What layer of the Sun are we seeing in this photo?
A) photosphere
B) chromosphere
C) corona
D) radiation zone
A) photosphere
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Answer the following statement true (T) or false (F)
Ten meter long steel railroad rails are laid end to end, with no space between, on a hot day when the temperature is 115.°F. Six months later the temperature has dropped to -2.°F
How much space now exists between each rail? [ linear expansion coef. for steel is 12. × 10-6 C°-1]
If a convex lens were made out of very thin clear plastic filled with air, and were then placed underwater where n = 1.33 and where the lens would have an effective index of refraction n = 1, the lens would act in the same way
a. as a concave mirror in air. b. as a concave lens in air. c. as a convex lens in air. d. as a flat refracting surface between water and air as seen from the water side. e. as the glasses worn by a farsighted person.
The chromosphere is faint because of its low density
Indicate whether the statement is true or false