What is the difference in frequency for spectral lines emitted by hydrogen for transitions from the n = 16 level to the n = 2 level and transitions from the n = 15 level to the n = 2 level? (RH = 1.097 × 10^7 m?1.)
a. 5.65 × 10^?13 Hz
b. 31 Hz
c. 1.77 × 10^12 Hz
d. 2.55 × 10^16 Hz
e. 1.02 × 10^17 Hz
c
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Ohm's Law: For the graph shown in the figure, what physical quantity does the slope of the graph represent for ohmic material?
A. power B. resistivity C. 1/(resistivity) D. resistance E. 1/(resistance)
The critical temperature for nucleosynthesis to begin was the:
A) triple alpha reaction at 100 million K. B) deuterium bottleneck at about 900 million K. C) proton-proton cycle at 10 million K. D) iron production at 10 billion K. E) formation of lithium at 50 million K.
If 1.0 m3 of concrete weighs 5 × 10^4 N, what is the height of the tallest cylindrical concrete pillar that will not collapse under its own weight? (The compression strength of concrete is 1.7 × 10^7 N/m2)
Any element heavier than helium is collectively referred to as a _______________
Fill in the blank(s) with correct word