`1 ` kg of water at `0°C` is taken in a vessel of water equivalent `100 g`. This vessel is kept at the focal plane of

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Q 3140491313.     `1 ` kg of water at `0°C` is taken in a vessel of water
equivalent `100 g`. This vessel is kept at the focal plane
of a concentrator type solar heater of area `10 m^2`,
which can reflect `90%` of energy incident on it. Find
the time taken to raise the temperature of water by
`100°C`. (Take solar constant as `1.4 k W m^(- 2)`, specific
heat capacity of water as `4.2 k J kg^(-1) text()^o C^(-1)` ).

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Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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