If the threshold wavelength for sodium is `5420 Å`, then the work function of sodium is

If threshold wavelength for sodium is 6800Å then the work function will be

Light of wavelength 4000 Å is incident on a sodium surface for which the threshold wavelength of photoelectrons is 5420 Å. The work function of sodium is

If the threshold wavelength for a certain metal is 2000Å , then the work function of the metal is

The threshold wavelength for tungsten is 2730 Å . The work function of tungsten is

The threshold wavelength for a certain metal is 2000 Å. The work function of the is

If the threshold wavelength for a certain metal 3000Å , then the work function of the metal is

The work functions of tungsten and sodium are 5.06 eV and 2.53 eV respectively. If the threshold wavelenth for sodium is 5896 Å , then the threshold wavelength for the tungsten will be