The Balmer Beta absorption line is a result of a transition of an electron in a hydrogen atom from:
A) level 2 to level 3.
B) level 2 to level 4.
C) level 3 to level 2.
D) level 4 to level 2.
E) None of the above.
B
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Protostars are in hydrostatic equilibrium
a. True b. False Indicate whether the statement is true or false
The length 3.76 mm is multiplied by 0.05 mm. The appropriately rounded product is
A. 0.18 
B. 0.2
C. 0.19
D. 0.1881
E. 0.29
The orbital period of a geosynchronous satellite is
A) 23 hours 56 minutes. B) 24 hours. C) 365.25 days. D) 12 years. E) 26,000 years.
Is the mass of an atomic nucleus greater or less than the sum of the masses of the nucleons composing it? Why don't the nucleon masses add up to the total nuclear mass?
A) Greater. We need to add the masses of the surrounding electrons to the masses of the nucleons. B) Neither. The mass of the atomic nucleus is exactly the sum of the masses of the nucleons. C) Less. The individual nucleons have greater mass when separated from the nucleus. This additional mass is a result of the energy of separation. D) Greater. The mass of the atomic nucleus also has mass of the "atomic glue" that holds the nucleons together in the nucleus.