What is photo emission?

What is photo emissive cells ?

Radiation of wavelength 5000 A^@ incidents on a metal surface to just cause photo emission. Calculate the work function of the metal.

What is field emission?

State the laws of photo emission.

Give any two applications of photo emission.

What is photo morphogenesis? How is induced?

A surface ejects electrons when illuminated by blue light but none with green light. Then photo emission is possible by light of which of the following colours?

A surface ejects electrons when illuminated by blue light but none with green light. Then photo emission is possible by light of which of the following colours?