GUJCET 2020 Physics Solved Paper

The threshold frequency is the minimum frequency of photon required that would cause ejection of photo electron.
The work function of metal is the minimum energy required by metal to cause ejection of electron from its surface.
They are related as
W0=hv
‌‌=6.626×10−34×5.16×1014J
‌‌=2.13eV