Threshold energy is equal to

Threshold energy is always ....... than activation energy.

Threshold energy minus the energy which the molecules actually possess is called ........

The Threshold energy is given as E_(0) and radiation of energy E falls on metal then K.E is given as

The Threshold energy is given as E_(0) and radiation of energy E falls on metal then K.E is given as

Photons of frequencies equal to the frequencies of H_(beta) and H_(oo) lines of hydrogen incident on a photosensitive plate, whose threshold frequency is equal to the frequency of H_(alpha) line of hydrogen. The ratio of the maximum kinetic energies of the emitted electrons is