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

### 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) ).

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