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 statements(s) is (are) true?