How is the circumference, Cn, of the nth orbit in hydrogen and the de Broglie wavelength, 
of the n th orbit related?
a. 
b. 
c. 
d. 
e. 
b.
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Which of the following is true of the star clusters in the Milky Way?
A) Open clusters are widely scattered in the Milky Way. B) Globular clusters are concentrated along the disk of the Milky Way. C) Open clusters are more common toward the constellation Sagittarius. D) Globular clusters are much too far away to have measureable parallaxes.
A 30-year-old woman takes a trip on a rocket, leaving her 20-year-old brother behind. She travels at a speed of 0.8 c, and is gone 20 years, according to the younger brother. When she returns, how many years older/younger is she than her brother?
a. 2 years younger b. 2 years older c. 3 years older d. 10 years older e. 8 years older
Hydrogen Balmer lines are essentially absent in the O and M type stars.
Answer the following statement true (T) or false (F)
A current can be made to flow in a wire if
a. it is connected to a battery. b. it is put into motion near a magnet. c. a magnet is put into motion near it. d. all of the above.