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 0.8 eV. The work function of the metal is:
0.65 eV
1.0 eV
1.3 eV
1.5 eV
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