A surface of area 1 m^(2) kept perpendicular to the sun rays absorbs 3 MJ solar energy in one hour. (a) What is the amount of solar energy absorbed by a solar heater when a surface of area of 9 cm^(2) is exposed perpendicular to the sun rays for 4 hours. (b) What is amount of time taken by this heater to boil 12 kg of water at 40^(@)C if its efficiency is 60% ? specific heat capacity of water =4200 J kg^(-1) .^(@)C^(-1)

A surface of area 1 m^(2) kept perpendicular to the sun rays absorbs 3

1.	A surface of area 1 m^(2) kept perpendicular to the sun rays absorbs 3 MJ solar energy in one hour. (a) What is the amount of solar energy absorbed by a solar heater when a surface of area of 9 cm^(2) is exposed perpendicular to the sun rays for 4 hours. (b) What is amount of time taken by this heater to boil 12 kg of water at 40^(@)C if its efficiency is 60% ? specific heat capacity of water =4200 J kg^(-1) .^(@)C^(-1)
Answer» SOLUTION :(i) `Q =msDeltat`(II) 567 KJ