Briefly explain the working principle of tandem or heterojunction solar cells
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Briefly explain the working principle of tandem or heterojunction solar cells.
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- Imagine a photon gas at inital temperature of T=100K . What is the temperature of the photon gas after it has undegone a reversible adiabatic expansion to 4 times its original volume ? a) 63K b) 400K c) 100K d) 37KA) Explain – based solely on thermodynamic considerations – why the entropy density of a photon cavity is proportional to T 3, independent of the size, shape and material of the cavity. B) Explain why the temperature of the cosmic background radiation is 2.725 K, and how this temperature evolves over. C) How would your answers to part a) and b) differ if we lived in a two-dimensional world?Calculate the thickness of Al and Cu required to attenuate narrow, collimated, monochromatic beams of 0.1-MeV and 0.8-MeV gamma rays to: (use appendix A) a. One-half of the incident beam (HVL) b. One-tenth the incident intensity (TVL). Express the answers in cm and in g/cm²