Values of work function `(W_0)` for a few metals are given below

The number of metals which will show photoelectric effect when light of wavelength `400nm` falls on it is ____
Given : `h =6.6 times10^(-34) j s `
`c=3times 10^(8)ms^(-1)`
`e=1.6 times 10^(-19)C`

The work function (phi) of some metals is listed below . The number of metals which will show photoelectric effect when light of 300 nm wavelength falls on the metal is :

The work function for a certain metal is 4.2eV. Will this metal give photoelectric emission for incident radiation of wavelength 330 nm? Use, h=6.6xx10^(-34)Js .

A metal X has a work function value of 2.1 eV Will there be any photoelectric emission for light of wavelength 5,000Å . Value nf h =6.63 xx10^(-34) J s^(-1) .

Which of the metal sodium and copper will be suitable for photelectric cell using light of wavelength 4000 Å . The work functions of sodium and copper are respectively 2.0 eV and 4.0 eV. Take h=6.6 xx 10^(-34) Js, c = 3.0 xx 10^(8) ms^(-1) and 1 eV = 1.6 xx 10^(-19) J

Calculate the energy in joule corresponding to light of wavelength 45 nm : (Planck' constant h = 6.63 xx 10^-34 Js , speed of light c = 3 xx 10^8 ms^-1 )