Calculate the energy output of a solar cell on a sunny day. When the sun is overhead, the power incident on each square meter of the ground is about 1000 W. Assuming a solar-cell efficiency of 15 %, estimate the daily energy output of a solar panel with an area of 10 square meters. Give the answer in joules and in kilowatt-hours.
a) 1.26 × 10^7 J, 3.5 kWh
b) 1.26 × 10^7 J, 0.35 kWh
c) 1.35 × 10^6 J, 3.5 kWh
d) 1.35 × 10^6 J, 0.35 kWh