Question

when the energy of the incident radiation is increased by 20% the kinetic energy of the photoelectrons emitted from a metal surface increased from 0.5 eV to 0.8eV the work function of the metal is​

Answer 1

Let Initial energy was E.

Then abter increasing it by 20% it becomes 1.2 E .

Let work function is  .

Then   E-  = 0.5 ev ------------(1)

         1.2 -  = 0.8 ev ------------(2)

or    



or 



Option 1)

0.65 eV

Incorrect

Option 2)

1.0 eV

Correct

Option 3)

1.3 eV

Incorrect

Option 4)

1.5 eV

Incorrect