Would you prefer a material having a high work function or a low work function to be used as a cathode in a diode?

Value of work function depend on……

SI unit of work function is……

Work function of ……is the lowest.

Define work function of metal and write its unit.

Explain emission of electron from metal.Define work function .Write its unit,work function of metal depend on which factors?

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 phi and the anode is a wire mesh of conducting material kept at distance d from the cathode. A potential different 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?

Answer the following questions: (d) Every metal has a definite work function. Why do all photoelectrons not come out with the same energy if incident radiation is monochromatic? Why is there an energy distribution of photoelectrons?

Light coming from a discharge tube filled with hydrogen falls on the cathode for the photoelectric cell. The work function of the surface of cathode is 4eV . Which one of the following values of the anode voltage (in volts) with respect to the cathode will likely to make the photo current zero?

Photoelectric effect takes place in element A. Its work function is 2.5 eV and threshold wavelength is lambda . An other element B is having work function of 5 eV . Then find out the wavelength that can produce photoelectric effect in B.