An O-star has a hotter surface temperature than the Sun. Therefore, compared to the Sun,
A) its emission peaks in the infrared part of the spectrum.
B) its emission peaks in the blue part of the spectrum.
C) it emits at about the same wavelengths as the Sun (similar peak) but it is much brighter.
D) it emits at about the same wavelengths as the Sun (similar peak) but it is much fainter.
B
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If the refractive index of the glass in a lens varies with wavelength, then which of the following results?
A) spherical aberration B) light scattering C) total reflection D) astigmatism E) chromatic aberration
The diagram is of a simple spectroscope. If lens #1 were omitted, the resulting spectrum would be
1) much dimmer. 2) upside down. 3) no different. If, instead, the slit were opened too wide, the middle of the spectrum would appear 4) white. 5) much narrower. 6) black. 7) a broader yellow.
Which of the following terms is given to a pair of stars that appear to change positions in the sky, indicating that they are orbiting one another?
A) visual binary B) eclipsing binary C) spectroscopic binary D) double star E) none of the above
What does it mean for a physical quantity in a system to be conserved?
a. It is used in the most efficient manner possible. b. It stays in its original state forever. c. The total amount of it in the system stays constant. d. none of the above.