**Please write so it\'s possible to read, had problems in the past with a good a

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**Please write so it's possible to read, had problems in the past with a good answer that wasn't legible at all Appreciate it

***Please only answer if you're very confident in your answer and you want to provide insight into answering the question, answers just thrown together so you can get your answer totals up are not what I'm looking for.

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5. A large maple tree collects sunlight over an area that is 8 m in diameter. The average solar radiation is 168 W/m2. The tree grows for 8 months of the year and is dormant for 4 months of the year. After ten years the mass of the tree has increased by 540 kg. What is the efficiency of converting sunlight into chemical energy?

Explanation / Answer

5. d = 8 m

S = 168 W/m^2

the tree has grown for 10*8 = 80 months = 207360000 s = t

every day lets assume half of the day is spent converting light to energy

hence

t' = t/2 = 103680000 s

now, energy recieved = S*pi*d^2*t'/4

E = 875536237159.4220 J = 8.75536237*10^11

now, energy in the form of mass dm = 540 kg

calorific value of wood = 20*10^6 J/kg

hence U = 20*10^6*540 = 1.08*10^10 J

hence efficiency = U*100/E = 1.23358 %

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