If a 0.5kg of Pu at 90 degree c is submerged in 2kg of water at 20 degree C inside a bomb calorimeter, what would be the final temperature of the system. C for Pu is 0.133j/g C

C for water is 4186 j/g C

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.