How would scientists most likely describe the system of the Earth in regard to energy? 1. Earth is an isolated closed system because energy only escapes the system as heat travels into space.

2. Earth is an isolated closed system because the atmosphere allows energy from the Sun to enter as heat.

3. Earth is an open system because the atmosphere stops energy from escaping into space.

4. Earth is an open system because heat energy from the Sun enters through the atmosphere.

the answer would be 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.