The Stefan-Boltzmann law indicates that the energy emitted per second per area of an emitting surface varies with the fourth power of the Kelvin temperature. Suppose the center of a sunspot on the Sun's photosphere is 4000 K and the normal photosphere is about 6000 K. About how much energy is emitted each second from each unit area in the center of this sunspot compared with that from the normal photosphere?
A) 10-8
B) 0.20
C) 0.67
D) 0.98
Correct Answer:
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Q92: What is the structure of a typical
Q93: Sunspots appear dark because they
A) are coronal
Q94: How does the number of sunspots on
Q95: A typical sunspot group lasts
A) virtually forever.
B)
Q96: What is the average length of
Q98: Sunspots are
A) cooler, darker regions on the
Q99: Other stars
A) have never been detected producing
Q100: What is the solar wind?
A) storm of
Q101: Over the course of a sunspot cycle
Q102: The rotation of the Sun is
A) slowest
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