At frequencies of the incident radiation above the threshold frequency, the photoelectric current in a photoelectric

What is threshold frequency in the photoelectric effect?

Define threshold frequency for photoelectric emission.

The threshold frequency of a photoelectric effect depends on

What is threshold frequency in photoelectric emission?

Photoelectric work function for a surface is 2.4 eV. Light of wavelength 6.8 xx 10^(-7) m shines on the surface. Find the frequency of incident light and also the threshold frequency. Will there be photoelectric emission or not ?