Up to what maximum potential will a copper ball, remote from all other bodies, be charged when irradiated by electromagnetic radiation of wavelength `lambda = 140 nm`?

Up to what potential V can a zinc ball (work function 3.74 eV) removed from other bodies be charged by irradiating it with light of lamda=200 nm ?

Up to what potential V can a zinc ball (work function 3.74 eV) removed from other bodies be charged by irradiating it with light of lamda=200 nm ?

If a surface has a work function 4.0 eV, what is the maximum velocity of electrons liberated from the surface when it is irradiated with ultraviolet radiation of wavelength 0.2 mum ?

If a surface has a work function 4.0 eV, what is the maximum velocity of electrons liberated from the surface when it is irradiated with ultraviolet radiation of wavelength 0.2 mum ?

Find the velocity of photoelectrons liberated by electromagnetic radiation of wavelength lambda=18.0nm from stationary He^(+) ions in the ground state.

Find the velocity of photoelectrons liberated by electromagnetic radiation of wavelength lambda=18.0nm from stationary He^(+) ions in the ground state.