1. Tardigrade
  2. Question
  3. Physics
  4. The beam of light has three wavelengths 4144 mathringA, 4972 mathringA and 6216 mathringA with a total intensity of 3.6 × 10-3 Wm 2 equally distributed amongst the three wavelengths. The beam falls normally on the area 1 cm 2 of a clean metallic surface of work function 2.3 eV. Assume that there is no loss of light by reflection and that each energetically capable photon ejects one electron. Calculate the number of photoelectrons liberated in 2 s.

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Q. The beam of light has three wavelengths $4144 \mathring{A}, 4972 \mathring{A}$ and $6216 \mathring{A}$ with a total intensity of $3.6 \times 10^{-3} Wm ^2$ equally distributed amongst the three wavelengths. The beam falls normally on the area $1 \,cm ^2$ of a clean metallic surface of work function $2.3\, eV$. Assume that there is no loss of light by reflection and that each energetically capable photon ejects one electron. Calculate the number of photoelectrons liberated in $2 s$.

Dual Nature of Radiation and Matter

Solution:

Correct answer is (b) $1.075 \times 10^{12}$