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Which of the following would be the expected effect on the difference in energy of the...

Which of the following would be the expected effect on the difference in energy of the lowest two vibrational levels in a molecule HX if hydrogen is replaced by deuterium, 2H? Explain.

(a) it will double

(b) it will halve

(c) it will go up by roughly a factor of 21/2

(d) it will go down by roughly a factor of 21/2

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