In Franck-Hertz experiment.. | Physics | JEE Main 2024

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JEE Main 2024

06-04-2024 S2

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In Franck-Hertz experiment, the first dip in the current-voltage graph for hydrogen is observed at 10.2 V . The wavelength of light emitted by hydrogen atom when excited to the first excitation level is $\_\_\_\_$ nm.
(Given $\mathrm{hc}=1245 \mathrm{eV} \mathrm{nm}, \mathrm{e}=1.6 \times 10^{-19} \mathrm{C}$ ).

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