Frequency of photons emitted in Paschen series is given by \( \mathrm{v}=3.29 \times 10^{15}(\ma...

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Frequency of photons emitted in Paschen series is given by \( \mathrm{v}=3.29 \times 10^{15}(\mathrm{hz})\left[\frac{1}{3^{2}}-\frac{1}{\mathrm{n}^{2}}\right] \). Value of \( \mathrm{n} \) for photon having wavelength \( 1285 \mathrm{~nm} \) will be:
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