Atypical photovoltaic cell delivers 4.2×10−3 w of electric energy when illuminated with 0.15 w of light energy. what is the efficiency of the cell?

2.8 %

Explanation:

Power deliver by the cell = 4.2 x 10^-3 W

Power given to the cell = 0.15 W

The efficiency of the cell is defined as the ratio of power deliver by the cell to the power given to the cell.

So, the efficiency of the cell

                       = power deliver by the cell / power given to the cell

                       =

                       = 0.028

in percentage form = 0.028 x 100 % = 2.8 %

Thus, the efficiency of the photo voltaic cell is 2.8 %.

c

explanation:

the bal will not change its velocity.