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A light of wavelength 3000 Å falls on a ...

A light of wavelength `3000 Å` falls on a metal surface. Ejected `e^(-)` is further accelerated by a potential difference of 2V, then final K.E of the `e^(-)` is found to be `8xx10^(-19)J`. If threshold energy for the metal surface is `'phi'eV`. Then find the numerical value of `8phi`

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