Here is a link that should help you out
http://instituteforenergyresearch.org/topics/encyclopedia/fossil-fuels/
Answer:
efficiency of solar panel is 18%
Explanation:
Energy received by the sunlight is given as

here we know the dimensions of the plate as


now we have


now the power received by the sun light is given as

now the output power due to solar panel is given as



now the efficiency is given as



C. High-visibility clothing is important to wear in areas with moving vehicles
There are two laws named for Kirchhoff. The both concern electrical circuits.
Here they are in my own words:
1). The sum of the voltage drops around any closed loop in a circuit is zero.
2). The sum of the currents at any single point in a circuit is zero.