Sodium and copper have work functions `2.3 eV and 4.5 eV` respectively . Then the ratio of the wavelength is nearest

Sodium and copper have work functions of 2.3eV and 4.5 eV respectively, then the ratio of the wavelengths is nearest to

Sodium and copper have work functions 2.3 eV and 4.6 eV respectively . Then the ratio of threshold wavelengths are respectively.

Sodium and copper have work functions 2.3eV and 4.5eV respectively, then the ratio of the threshold wavelengths is nearest to

Sodium and copper have work functions of 2.3 eV and 4.5 eV. The ratio of their corresponding threshold wavelengths will be approximately equal to

Two metal A and B have work functions, 2eV and 5eV respectively. Which metal has lower threshold wavelength?