Mohammed listed the steps that occur when a solar cell generates electricity.
1: Solar energy is absorbed by the cell.
2: Free electrons move to the front of the cell.
3: Electrons begin to move.
4: Electrons flow as electricity.
Which best explains how to correct Mohammed's error?
Switch steps 2 and 3.
Switch steps 3 and 4.
Move step 1 to appear after step 4.
Move step 4 to appear after step 1.

Which best represents the law of conservation of mass ?

On a mild saturday morning while people are working inside, the furnace keeps the temperature inside the building at 23degreesc. at noon the furnace is turned off, and the people go home. the temperature outside is a constant 16degreesc for the rest of the afternoon. if the time constant for the building is 3 hr, when will the temperature inside the building reach 18degreesc? if some windows are left open and the time constant drops to 2 hr, when will the temperature inside reach 18degreesc?

Which is a substance that can be separated by physical means and is not the same throughout