The work function of metals is in the ra...

The work function of metals is in the range of 2 eV to 5 eV. Find which of the following wavelength of light cannot be used for photoelectric effect. (Consider, Planck's constant `= 4 xx 10^(-15) eV.s`, velocity of light `= 3 xx 10^(8) m//s`)

510 nm

650 nm

400 nm

570 nm

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