A) 0.6 V
B) 2.0 V
C) 3.4 V
D) 1.4 V
Correct Answer: A
Solution :
Key Idea: Stopping potential is a measure of the maximum kinetic energy of the electrons. From Plancks quantum theory, the maximum kinetic energy\[({{E}_{k}})\]of photoelectron emitted from the metal is \[{{E}_{k}}=hv-W\] where W is work function of metal and\[hv\]is the energy of the photon absorbed by the metal. Given, \[hv=2\text{ }eV,\text{ }W=1.4\text{ }eV\] \[\therefore \] \[{{E}_{k}}=2-1.4=0.6\,eV\] Hence, stopping potential is,\[{{V}_{s}}=\frac{E}{e}=\frac{0.6\,eV}{e}\]. \[=0.6V\]
You need to login to perform this action.
You will be redirected in
3 sec
