First slide

Electromagnetic radiation and spectra

Question

The work function ( $ϕ$ ) of some metals is listed below' The number of metals which will show photoelectric effect when light of 300 nm wavelength falls on the metal is

Moderate

Solution

$E_{n} = \frac{E for H \times Z^{2}}{n^{2}} = \frac{- 13 .6 \times 1^{2}}{25} = - 0 .54 eV$

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