The Phono-Solar PS250P-20-U single crystal (module) silicon photovoltaic panel system has dimensions of 2m X 1 m and delivers 400W at 19.9% efficiency under normal solar illumination. Its installation cost is $276, and has a warrantied lifetime of 25 years. The average insolation (solar hours per day in NY) is about 3.5 hours. Assume there are 20,000,000 New Yorkers, that NY has a land area of 141300 km2 , and that New Yorkers, per capita, according to the Government EIA office, consume 606 kW-hr of electricity per capita per month (2017 numbers). Hence estimate: 1. How many panels are needed to match the electricity demand of New York ? 2. What is the total cost ?

The photoelectric effect occurs when light (or similar incident radiation, including X-rays) falls on material together with a metal plate and causes it to emit electrons. The discovery of the photoelectric effect led to important new theories (and to a …