What is the source of the X rays emitted by the solar corona?
A) high-energy electrons spiraling at high speed along the coronal magnetic fields
B) X rays from the solar photosphere, scattered from ions in the corona
C) decaying radioactive nuclei in the hot coronal gases
D) extremely high-temperature gas
Correct Answer:
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Q81: The heliosphere is a bubble in space
Q84: The umbra of a sunspot is about
Q88: How does the temperature inside the umbra
Q89: What is the average length of time
Q90: The extremely high gas temperatures in the
Q93: Sunspots appear dark because they
A) are coronal
Q94: How does the number of sunspots on
Q94: What is the structure of a typical
Q95: A typical sunspot group lasts
A) virtually forever.
B)
Q96: The heliosphere is the:
A) region surrounding Earth,
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