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Radiation from a hydrogen discharge tub...

Radiation from a hydrogen discharge tube ( energy of photons `le 13.6 eV`) goes through a fliter which transmits only waves of wavelength greater than `4400Å` and is incident on a metal of work function `2.0 eV`. If stopping potential is `nxx10^(-2)` volts. Find the value of `'n'`

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The correct Answer is:
`55`
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