The number of sunspots and their activity peak about every:
A) 36 days.
B) six months.
C) year.
D) eleven years.
E) 76 years.
D
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Diagram 7-1 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?
Why do sunspots appear dark in pictures of the Sun?
A) They are too cold to emit any visible light. B) They are holes in the solar surface through which we can see through to deeper, darker layers of the Sun. C) They are extremely hot and emit all their radiation as X-rays rather than visible light. D) They actually are fairly bright, but appear dark against the even brighter background of the surrounding photosphere.
Object A in the shape of a disk of radius r is placed a distance R away from an intense light source. Object B, made from the same material as object A, is in the shape of a disk of radius 2r and placed a distance 2R away from the same light source
We observe which of the following? A) Both objects experience the same amount of radiation pressure but receive different amounts of linear momentum. B) The objects experience different amounts of radiation pressure and receive different amounts of linear momentum. C) Both objects experience the same amount of radiation pressure and the same amount of linear momentum. D) The objects experience different amounts of radiation pressure but receive the same amount of linear momentum.
Conversion of Units: The radius of the earth is 3963 mi. Which one of the following numbers is closest to the surface area of the earth? (1.0 mi = 1609 m)
A. 4.9 × 107 m2 B. 1.3 × 1014 m2 C. 2.6 × 1014 m2 D. 5.1 × 1014 m2