The inner planets—mercury, venus, earth, and mars—are believed to have been formed by 1. the explosion of supernovas 2. masses of cold hydrogen and helium 3. the combining of asteroid-sized debris 4.collisions with large galaxies

i believe the answer is B :/

i think its 5049.

i hope this !

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.