Work functions for zinc is 3.6 eV. If threshold frequency for zinc is `9 xx 10^(14)` cps, determine the value of Planck's constant. (`1eV = 1.6 xx 10^(-12)`erg)

Explanation

Work function, `W_(0) = 3.6eV = 3.6 xx 1.6 xx 10^(-12)` erg
Threshold frequency, `f_(0) = 9 xx 10^(14)` cps = `9 xx 10^(14)Hz`
As `W_(0) = hf_(0)`
so, `h = (W_(0))/(f_(0)) = (3.6 xx 1.6 xx 10^(-12))/(9 xx 10^(14)) = 6.4 xx 10^(-27)` erg.s