Light of wavelength ${\lambda }_{ph}$ falls on a cathode plate inside a vacuum tube as shown in the figure. The work function of the cathode surface is $\varphi$ and  the anode is a wire mesh of conducting material kept at a distance d from the cathode. A potential difference  V is maintained between the electrodes. If the minimum de Broglie wavelength of the electrons passing through the anode is  ${\lambda }_e$, Which of the following statement(s) is(are)true?