Threshold wavelength for photoelectric effect on sodium is `5000 Å` . Its work function is

The threshold wavelength for photoelectric effect on sodium is 5000A^(@) . Its work function is

The threshold wavelength for photoelectric effect on sodium is 5000 overset@A . Its work function is:

Define threshold wavelength for photoelectric effect.

Define threshold wavelength for photoelectric effect.

The threshold wavelength for photoelectric effect of a metal is 6500 Å. The work function of the metal is approximately