A photo sensitive surface is receiving light of wavelength 5000 Å at the rate of J/s. The number of — Atomic Structure Chemistry Question

💡 Solution & Explanation

Energy of one photon $E = \frac{hc}{\lambda} = \frac{6.626 \times 10^{-34} \times 3 \times 10^8}{5000 \times 10^{-10}} \approx 3.975 \times 10^{-19}$ J. Number of photons per second $n = \frac{\text{Power}}{E} = \frac{10^{-7}}{3.975 \times 10^{-19}} \approx 2.5 \times 10^{11}$. Therefore, correct answer is A.