The Sun's observed spectrum is
A) a continuum with no lines, as shown by the rainbow.
B) only emission lines on a black background.
C) only absorption lines on a black background.
D) a continuum with absorption lines.
E) a continuum with emission lines.
D
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Suppose the following graph shows the potential energy function for a certain hypothetical interaction. 
This interaction is A. attractive for all r. B. repulsive for all r. C. attractive for small r, but repulsive for large r. D. repulsive for small r, but attractive for large r. E. impossible to characterize without more information.
In the 1960s, Maarten Schmidt determined that quasars were very distant objects by
A) determining how luminous they were. B) determining how small the source of light was from its variations in luminosity. C) discovering that they were embedded in distant galaxies. D) determining their redshifts. E) determining their parallax angles.
In dielectric materials the polarization is small, _________, and reversible.
Fill in the blank(s) with the appropriate word(s).
An ideal solenoid with 3000 turns is 70.0 cm long. If its self-inductance is 25.0 mH, what is its radius? (?0 = 4? × 10-7 T ? m/A)
A) 0.0222 m B) 52.0 m C) 0.00199 m D) 327 m