Solution:
When the frequency of incident radiation is increased, then the energy of photon increases. When energy of photons becomes greater than work function then photo-electrons are emitted.
A photosensitive metal is not emitting photo-electrons when irradiated. It will do so when threshold is crossed. To cross threshold we need to 6. increase
When the frequency of incident radiation is increased, then the energy of photon increases. When energy of photons becomes greater than work function then photo-electrons are emitted.