The first emission line of Balmer series in \( \mathrm{H} \) spectrum has the wave number equal ...

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The first emission line of Balmer series in \( \mathrm{H} \) spectrum has the wave number equal to:
(a) \( \frac{9 \mathrm{R}_{\mathrm{H}}}{400} \mathrm{~cm}^{-1} \)
(b) \( \frac{7 \mathrm{R}_{\mathrm{H}}}{144} \mathrm{~cm}^{-1} \)
(c) \( \frac{3 \mathrm{R}_{\mathrm{H}}}{4} \mathrm{~cm}^{-1} \)
(d) \( \frac{5 \mathrm{R}_{\mathrm{H}}}{36} \mathrm{~cm}^{-1} \)
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