A monochromatic neon lamp with wavelength of 670 . 5 nm illuminates a photo-sensitive material which has a stopping voltage of 0 . 48 V . What will be the stopping voltage if the source light is changed with another source of wavelength of 474 . 6 nm ?

Question

A monochromatic neon lamp with wavelength of 670 . 5 nm illuminates a photo-sensitive material which has a stopping voltage of 0 . 48 V . What will be the stopping voltage if the source light is changed with another source of wavelength of 474 . 6 nm ?, 0 . 24 V, 1 . 5 V, 1 . 25 V, 0 . 96 V

MARKS App · Accepted Answer

eV s = hc λ - ϕ e V ' - V = h c 1 λ ' - 1 λ V ' = hc e 1 λ ' - 1 λ + V = 1240 1 474 - 1 670 + 0 . 48 = 1 . 25 eV

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