1. Which one of the following best describe sublimation? A. A solid melting to a liquid which re solidifies.

B. A solid melting to a liquid which evaporates, the vapor condensing to a liquid and then recrystallizing.

C. The movement of gaseous particles so that they fill the spaces that they occupy.

D. A solid forming a vapor on heating and reforming as a solid on cooling.

E. The bombardment of large molecules by small molecules.

i think it is D.

Explanation:

The answer is D because it’s where a solid turns to a gas without going through a liquid phase if that makes sense

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.