How many significant figures should the result have 2.524 g (5.1 • 106 g)

Two  

Step-by-step explanation:

In multiplication problems, your answer can have no more significant figures than the number with the fewest significant figures.

Start with the calculation inside parentheses:

5.1 × 10.6 = 54.060 000 00 (by my calculator)

There are three significant figures in 10.6, but only two in 5.1.

In this were a number you had to report, you would round to two significant figures and report the answer as 54.

54.060 000 00 → 54 (to two significant figures)

However, you must multiply this intermediate answer by 2.524.

Therefore, you multiply the number in the calculator by 2.524 and get

54.060 000 00 × 2.524 = 136.447 4400

NOW, you round to two significant figures and report the answer as 140.

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.