23 select the correct answer. at what stage of stellar evolution does a star have a shell of burning material and a non-fusing core? a. the giant stage b. the dwarf stage c. the protostar stage d. the supernova stage e. the main sequence stage

im not entirely sure but i think giant stage

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.