Question

an electro magnetic radiation of energy 5.6 eV fall on metal which eject an electron with kinetic energy of 2.6 ev.the work function of metal is
a. 4.8X 10^–19j
b.5.6 x 10^–19j
c.2.6x10^—19j
d.5.6j​

Answer 1

Answer:

a

Explanation:

Total energy= work function+ kinetic energy

5.6eV=5.6×1.6×10^-19 j

2.6eV= 2.6×1.6×10^-19 j

5.6×1.6×10^-19 = work function+ 2.6×1.6×10^-19

1.6×10^-19(5.6-2.6)= work function

work function=3×1.6×10^-19j

=4.8×10^-19j