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Question

If R is the Rydberg Constant in cm1, then hydrogen atom does not emit any radiation of wavelength in the range of

A
1R to 43R cm
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B
75R to 195R cm
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C
4R to 365R cm
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D
9R to 1447R cm
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Solution

The correct option is B 75R to 195R cm
Option a belongs to Lyman series where transition is from first orbit to any other orbits upto infinity.
Option c belongs to Balman series where transition is from second orbit to any other orbits upto infinity.
Option d belongs to Paschen series where transition is from third orbit to any other orbits upto infinity.

Option (b) does not belong to any transition series. Therefore, hydrogen atom does not emit any radiation of wavelength in this range.

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