Threshold wavelength for photoelectric emission from a metal surface is `3800Å`, Utraviolet light of wave-length `2600Å` is incident on the metal surface.
Find the work function of the metal and

Explanation

Threshold wavelength, `lamda_(0) = 3800 Å = 3800 xx 10^(-8) cm`
`:.` Work function,
`W_(0) = hf_(0) = h(c)/(lamda_(0)) = (6.63 xx 10^(-27) xx 3 xx 10^(10))/(3800 xx 10^(-8))` erg
`= (6.63 xx 10^(-27) xx 3 xx 10^(10))/(3800 xx 10^(-8) xx 1.6 xx 10^(-12))eV = 3.27 eV`