Sun rays are allowed to fall on a lens of diameter 20 cm. They are brought to focus on a calorimeter containing 20 g of ice. If the absorption by the lens is negligible, the time required to melt all the ice is
(Take, solar constant 
and 
)
Text Solution
Verified by ExpertsThe correct answer is:
D
Heat required to melt whole ice is
Energy incident per minute is
Therefore, time required to melt whole ice is 
2.7 min
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