Question

solve 13):


13. A photon ofenergy hv is absorbed by a free electron of metal having work function $\mathrm{\varphi }<$hv then
a) the electron is sure to come out

b) the electron is sure to come out with K.E. (hv - $\mathrm{\varphi }$)
c) either the electron does not come out or it comes out with K.E. (hv + $\mathrm{\varphi }$)

Answer 1

Dear student

$$\begin{gathered} a)K_{max}=h\vartheta -\varphi \\ Nowitmayhappenthattheelectronthatiscomingoutfromthemetalloosetheentireenergy(h\vartheta -\varphi )inthecollisionwiththeotherionsandatomsinthe \\ metal.Sotherangeofkineticenergyoftheelectronthatishavingtheenergy(h\vartheta -\varphi )sufficienttocomeoutis \\ 0\le K\le K_{max} \\ 0\le K\le h\vartheta -\varphi \\ a)Noelectronmaynotcomeout \\ b)No \\ c)False(Maximumkineticenergycanbe(h\vartheta -\varphi )butnotalltheelectronswillcomeoutwiththiskineticenergy. \\ Regards \end{gathered}$$