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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Significant Figures: What is 0.2052/3, to the correct number of significant figures?
A. 0.348 B. 0.35 C. 0.3 D. 0.3477
Physics & Space Science
Seawater has a density of 1,025 
at the surface. The bulk modulus of seawater is 
What is the density of seawater at a depth of 10.00 km?
A. 1074 
B. 1230
C. 1574
D. 1764
E. 1973
Physics & Space Science
Which will warm up quicker in sunlight?
A) a piece of colored glass B) a piece of clear glass C) both the same
Physics & Space Science
Continental crust is
A) thinner than oceanic crust. B) less dense than oceanic crust. C) more dense than oceanic crust. D) thinner and more dense than oceanic crust.
Physics & Space Science