Many objects in the sky, including the Sun, primarily emit blackbody radiation because they are mostly:
A) composed of only electrons.
B) opaque.
C) composed of only protons.
D) translucent.
Question 2Which of the following statements is true of reconnection events?
A) They refer to the breaking of identically directed magnetic field lines in a plasma.
B) Kinetic and thermal energy in plasmas with low conductivity are converted to magnetic energy.
C) Solar flares occur in active regions where oppositely directed magnetic fields meet and cancel each other.
D) They generate and release magnetic fields as long-wavelength photons and low-energy electrons.
Question 3The two most abundant elements in the Sun are:
A) magnesium and carbon.
B) hydrogen and helium.
C) nitrogen and neon.
D) iron and oxygen.
Question 4Which of the following indicates that the Sun must be gas from its surface to its center?
A) Its low density and high temperature
B) Its limited gravitational force
C) Its hot spots on the photosphere
D) Its weak magnetic field and small diameter
Question 5If you move an electron from a lower energy level to a higher energy level, you can call the atom a(n) _____.
A) excited atom
B) neutral atom
C) disassociated atom
D) grounded atom
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