Two spectral lines in a spectrum have frequencies of 2.0 x 1014 Hz and 4.6 x 1014 Hz. A higher-frequency line in the same spectrum likely has a frequency of
A) 2.6 x 1014 Hz.
B) 6.6 x 1014 Hz.
C) 13.2 x 1014 Hz.
D) none of the above
Answer: B
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