A metallic surface has a threshold wavelength 5200 A. This surfece is irradiated by monochromatic light of wavelength 4500 A. Which ofthe following statements is true ?

A metallic surface has a threshold wavelength 5200overset@A .This surface is irradiated by monochromatic light of wavelength 4500overset@A . The true statement is

In an experiment tungsten cathode which has a threshold wavelength 2300 Å is irradiated by ultraviolet light of wavelength 1800 Å . Calculate (a) maximum energy of emitted photoelectronos & (b) work function of the tungsten

When a metallic surface of threshold wavelength 4lamda is illuminated with light of wavelength lamda the stopping potential is V. When the same surface is illuminated by the light of wavelength 2lamda Stopping potential is V/3 Threshold wavelength for the metallic surface is