1. Solar Cells – What are they really..?
- Subbu R Subramanian
2. The Photo Electric Effect
When light waves of appropriate wave length hit an atom, the
electrons of the atom get excited. The excited electrons jump out of the
orbit, making the atom an ion. This movement of Electrons causes
Electric Current.
Albert Einstein found this phenomenon in 1905. He was awarded
Nobel Price for Physics for this finding.
3. •Different element’s atoms get excited with different wave
lengths of light . (different colour lights )
Ex : Sodium with yellow band light, Potassium with green
band etc