Which is a characteristic of collids a) are homogeneous mixtures
b) have large dispersed particles
c) will settle out over time
d) are made up of at least two substances

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.

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.