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The first emission line of hydrogen atomic spectrum in the Balmer series appears at (R = Rydberg constant) :


( A ) $\frac{7R}{36}cm^{-1}$
( B ) $\frac{5R}{36}cm^{-1}$
( C ) $\frac{9R}{400}cm^{-1}$
( D ) $\frac{3R}{4}cm^{-1}$

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