It is harder to remove a free eletron from copper than from sodium .Which metal has greater work function?Which has higher threshold waelength?

It is harder to remove free electrons from copper than from sodium. Which has higher work function.

It is easier to remove an electron from sodium than from copper, why? Which metal has higher value of threshold frequency?

The work function of metal A is higher than the work function of metal B. which of these metals has higher threshold wavelength?

Two metals A and B have work functions 4eV and 10eV respectively. Which metal has higher threshold wavelength?

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

Which animal has become extinct from India?

Photoelectric effect When light of sufficiently small wavelength is incident on a metal cathode, it may emit electsons called photoelectrons. This is called photoelectric effect. Above threshold frequency, the stopping potential and hence the energy of the photoelectrons is directly proportional to the frequency. In the given figure, we see the variation of stopping potential with the frquency of incident radiation for three metals A, B and C Which metal has the largest threshold wavelength?