in Q-82, the work function is

The work function of a metal

Assertion : The work function of a metal is different at different temperature . Reason : The increases in the temperature of metals decreases the work function of metal.

Define work function.

Radiations of two different frequencies whose photon energies are 3.4 eV and 8.2 eV successively illuminate a metal surface whose work function is 1.8eV. The ratio of the maximum speeds of the emitted electrons will be

Radiations of two different frequencies whose photon energies are 3.4 eV and 8.2 eV successively illuminate a metal surface whose work function is 1.8eV. The ratio of the maximum speeds of the emitted electrons will be