Which one of the following graphs in figure shows the variation of photoelectric current `(I)` with voltage `(V)` between the electrodes in a photoelectric cell?

Options

A.
B.
C.
D.

Answer

A

Explanation

Kinetic energy of an electron is given by
`k=1/2 mv^(2) =eV =` same for both electron
Where V= Speed of electron
Linear momentum of two electron may be different, in direction but their magnitude i.e. `mv=sqrt(2mk)`
will be same. De-broglie wavelength is given by
`lambda=h/(mv)` =same for both electrons
Minimum wavelength of produced x-rays is given by
`lambda_("min")=(hc)/(eV)` same for both electrons