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### Question Asked by a Student from EXXAMM.com Team

** 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)` ).