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Q: Solar radiation of average energy ~ 1.25 eV and intensity 500 W/m2 are incident on the surface of a solar flat plate collector. What is the approximate photon flux density impinging on the surface of the collector ? (1) ~ 5 × 1022 photons m–2s–1 (2) ~ 2 × 1022 photons m–2s–1 (3) ~ 2.5 × 1020 photons m–2s–1 (4) ~ 2.5 × 1021 photons m–2s–1 subscribe our channel http://www.youtube.com/c/MindMappingE... numerical questions with complete solutions (nta ugc net jrf environmental sciences) https://www.youtube.com/playlist?list... previous years solved question papers (environmental sciences) https://www.youtube.com/playlist?list... Best online coaching for ecology, biology, net jrf, CTET, Upsc, GATE, CSIR NET #mindmapping #environmentalsciences NTA UGC NET how to prepare for upsc Best book for net jrf Best coaching for tet Clear your CTET how to become IAS environmental science Importance of environmental sciences Gk for competition exam