Question

Wavelength of incident radiation is
400nm. Threshold wavelength of the
metal is 620nm. Kinetic energy of
photo electrons is kJ/mole
(1) 1.6x10-19
(2) 1.03
(3) 199.6
(4) 99.6​

Answer 1

Answer:

Explanation:

 we know that , hc/λ = hc/λ° + K.E

            now put the values and u will get KE as approx 1.03