Atomic StructureHard
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 O2. The average energy storage in the photosynthesis process is 111.6 kcal/mol of O2 evolved. What is the energy conversion efficiency in this experiment? ($\frac{h.c}{e}$= 1.24 × 10−6 nm. eV, 1 eV = 23 kcal/mol)
Options
A.70%
B.50%
C.40%
D.30%
Solution
$E = 9 \times \frac{12400}{6900} \times 23 = 372\text{ kcal.mole}$
∴ Energy conversion efficiency $= \frac{111.6}{372} \times 100 = 30\%$
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