Work funciton of a metal is 2.51eV. It threshold frequency is

If the photoelectric work function of a metal is 5 eV , the threshold frequency of the metal is

The work funtion of metal is 6.6eV .Find its threshold frequency.

The work function of a metal is 3.4 eV. If the frequency of incident radiation is increased to twice, then the work function of the metal becomes.