Final answer:
The average width of the elodea leaf cells is 50μm.
Step-by-step explanation:
To find the average width of an elodea leaf under high power, we need to divide the diameter by the number of cells. Given that the diameter is 0.4mm and there are 8 cells, we can calculate the average width as follows:
Average Width = Diameter / Number of Cells
Average Width = 0.4mm / 8
Average Width = 0.05mm = 50μm
Therefore, the average width of the elodea leaf cells is 50μm.