Energy Levels: What frequency must a photon have to raise an electron in a hydrogen atom from the n = 2 to the n = 4 state? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 3.06 × 1014 Hz
B. 6.16 × 1014 Hz
C. 4.11 × 1014 Hz
D. 5.20 × 1014 Hz
E. 9.24 × 1014 Hz
Answer: B
Physics & Space Science
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Seawater has a density of 1,025 
at the surface. The bulk modulus of seawater is 
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A. 1074 
B. 1230
C. 1574
D. 1764
E. 1973
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Significant Figures: What is 0.2052/3, to the correct number of significant figures?
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