In a measurement of the quantum efficiency of photosynthesis in green plants, it was found that 9 quanta of red light at 6900 Å were needed to evolve 1 molecule of . The average energy storage in the

Question

In a measurement of the quantum efficiency of photosynthesis in green plants, it was found that 9 quanta of red light at 6900 Å were needed to evolve 1 molecule of $O_2$. The average energy storage in the photosynthesis process is 111.6 kcal/mol of $O_2$ evolved. What is the energy conversion efficiency in this experiment? (hc/e = 1.24 × 10^-7 nm·eV, 1 eV = 23 kcal/mol)

Prashant Kotian · Accepted Answer

Correct answer: D. E per red photon = 1240/690 = 1.8 eV. 9 photons = 16.2 eV = 16.2 × 23 = 372.6 kcal/mol. Efficiency = 111.6/372.6 × 100% ≈ 30%.

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