Brain Exercise - Crossword

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Across
  1. 4. Technology used to harness wind energy
  2. 8. Material that can absorb photons and convert them to electrons
  3. 10. Type of current produced by photovoltaic cells
  4. 11. Device used to measure electrical resistance
  5. 13. The science of light and vision
  6. 14. Ancient city known for its hanging gardens, one of the Seven Wonders
  7. 15. City that hosts the annual Nobel Prize award ceremony
Down
  1. 1. Power of solar radiation per unit area
  2. 2. The smallest particle of an element that retains its properties
  3. 3. Amount of solar radiation reaching a given area
  4. 5. Type of energy derived from the Earth's internal heat
  5. 6. Technology that converts sunlight directly into electricity
  6. 7. Greek philosopher known for his method of questioning
  7. 9. Primary pigment in plants responsible for photosynthesis
  8. 12. Painter known for "Starry Night"