Final answer:
The efficiency of the photovoltaic cell is 17.27%.
Step-by-step explanation:
To calculate the efficiency of the photovoltaic cell, we need to compare the power output of the cell to the power input from the sunlight. The power output is given as 1.9 W. The intensity of sunlight is 1100 W/m². The area of the cell is 10 cm x 10 cm, or 0.1 m x 0.1 m = 0.01 m². So, the power input is 1100 W/m² x 0.01 m² = 11 W. Now we can calculate the efficiency by dividing the power output by the power input, and multiplying by 100 to express it as a percentage:
Efficiency = (1.9 W / 11 W) x 100% = 17.27% (rounded to two decimal places).