In photoelectric emission process from a metal of work function 1.8 eV, the kinetic energy of most energetic electrons is 0.5 eV. The corresponding stopping potential is
1.8 V
1.2 V
0.5 V
2.3 V
As we discussed in concept
Stopping Potential /Cut-off Potential -
It is defined as the potential necessary to stop any electron from reaching the other side.
-
Stopping potential is amount of voltage needed to stop maximum energy electron.
Here maximum Kinetic energy = 0.5 eV
Stopping potential = 0.5 V
Option 1)
1.8 V
This option is incorrect.
Option 2)
1.2 V
This option is incorrect.
Option 3)
0.5 V
This option is correct.
Option 4)
2.3 V
This option is incorrect.