Ejection of photo electron from silver metal can be stopped by applyin

1.	Ejection of photo electron from silver metal can be stopped by applying a voltage of 0.35 volt, when radiation of wave length of 256.7 x 10-9 meter is used. Calculate work function.
Answer» Energy of incident radiation= hc/ ʎ Put the values =7.74 x 10^-19 J =7.74 x 10^-19 x 1.602 x 10^-19 = 4.83 eV W₀ = E- KE =4.83 - 0.35 =4.48 eV

Ejection of photo electron from silver metal can be stopped by applying a voltage of 0.35 volt, when radiation of wave length of 256.7 x 10-9 meter is used. Calculate work function.

Answer»

Energy of incident radiation= hc/ ʎ

Put the values

=7.74 x 10^-19 J

=7.74 x 10^-19 x 1.602 x 10^-19 = 4.83 eV

W₀ = E- KE

=4.83 - 0.35

=4.48 eV