" The photo-electrons emitted from a surface of sodium metal are such that "

The photo electrons emitted from the surface of sodium metal are

The photo electrons emitted from the surface of sodium metal are

The photoelectrons emitted from a metal surface:

The photoelectrons emitted from a metal surface:

Photoelectrons emitted from a metallic surface are

Photoelectrons emitted from a metallic surface are

The work function for a metal is 40 eV . To emit photo electrons of zero velocity from the surface of the metal the wavelength of incident light should be x nm .