Why is an absorption spectrum especially useful for astronomers? O It helped astronomers to understand the rainbows we see on Earth after storms
O It shows that the stars are transparent; we can see right through them
O It has bright lines in it which allow astronomers to determine how bright the star is
O It has dark lines in it that allow astronomers to determine what elements are in the
star

give me abc and i will get it for u.

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.