CBSE Class 10 Answered
please answer
Asked by Sanjula | 11 Jun, 2009, 11:28: AM
Expert Answer
1)Solar energy is the radiant light and heat from the Sun that has been harnessed by humans since ancient times using a range of ever-evolving technologies. The Earth receives 174 petawatts (PW) of incoming solar radiation (insolation) at the upper atmosphere. Approximately 30% is reflected back to space while the rest is absorbed by clouds, oceans and land masses. The spectrum of solar light at the Earth's surface is mostly spread across the visible and near-infrared ranges with a small part in the near-ultraviolet.
Answered by | 12 Jun, 2009, 02:14: AM
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