When lithium is irradiated with light, one finds a stopping potential of 1.83V for lambda = 3000A^@ and 0.80V for lambda = 4000A^@. With the known charge on the electron, the work function of lithium is

When lithium is irradiated with light, one finds a stopping potential

1.	When lithium is irradiated with light, one finds a stopping potential of 1.83V for lambda = 3000A^@ and 0.80V for lambda = 4000A^@. With the known charge on the electron, the work function of lithium is
Answer» 4.6eV `3.68xx10^(-19) J` `2.3 EV` `1.2 eV` SOLUTION :`(hC)/(lambda_1) = W_0 = KE_1 , (hC)/(lambda_2) = W_0 + KE_2` `therefore W_0 = 2.3 eV`