Imagine that there is a group that does not use instruments, but an individual replicates the sound of drums to maintain the beat. What term BEST describes this group? Chorus quartet a cappella orchestra

the solar system used to have much dust particles option no d

i believe the answer is a.

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.