Let a light beam of total intensity $1\mu \mathrm{W}{\mathrm{cm}}^{-2}$ falls on a clean iron sample piece with J work function 4.5 eV and of 1.0 cm² area. Assume that iron sample reflects 96% of light and that only 3% ofthe absorbed energy lies in the violet region which can cause photoemission (of wavelength 250 nm). Number of electrons emitted will be

• A

  $1.5\times {10}^{10}\text{ electrons per second }$

• B

  $3.0\times {10}^9\text{ electrons per second }$

• C

  $3.0\times {10}^{10}\text{ electrons per second }$

• D

  $1.5\times {10}^9\text{ electrons per second }$