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# Stuck here, help me understand: 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

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

• Option 1)

1.8 V

• Option 2)

1.2 V

• Option 3)

0.5 V

• Option 4)

2.3 V

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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

$\therefore$ 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.

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