One kg of steam in a piston/cylinder device undergoes the following changes of state. Calculate Q and W for each step. a. Initially at 350 kPa and 250°C, it is cooled at constant pressure to 150°C. b. Initially at 350 kPa and 250°C, it is cooled at constant volume to 150°C.

the answer is c) gamma rays

hope i : )

they are all solids.

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.