Will photoelectrons be emitted from a copper surface, of work function `4.4 eV`, when illuminated by a visible light?

Will photoelectrons be emitted by a copper surface of work function 4.4eV when illuminated by visible light?

Will photoelectrons be emitted by copper plate of work function 4.4eV when illuminated by visible light?

Calculate the retarding potential required to stop the photoelectrons emitted from a metal surface of work function 1.2 eV , when light of frequency 6.3xx 10^(14) Hz is incident on it

Visible light cannot eject photoelectrons from copper surface, whose work function is 4.4 eV. Why? Prove it mathematically.

The maximum kinetic energy of photoelectrons emitted from a metal surface increses from 0.4 eV to 1.2 eV when the frequency of the incident radiation is increased by 40% . What is the work function (in eV) of the metal surface?

The maximum kinetic energy of photoelectrons emitted from a metal surface increses from 0.4 eV to 1.2 eV when the frequency of the incident radiation is increased by 40% . What is the work function (in eV) of the metal surface?

When the energy of the incident radiation is increased by 20 % , kinetic energy of the photoelectrons emitted from a metal surface increased from 0.5 eV to 0.8 eV . The work function of the metal is