(95 90
An unknown insoluble substance displaced the water shown. Its mass is indicated on the triple beam balance.
0
100 200
300 400 500 600 700 800 900
0
10
20
30
40
50 60 70
80
90
.
Use the diagrams above to answer the following question
Volume of water displaced
ml

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.