Black and White Cans Warm up Crossword

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Across
  1. 1. Thermal energy transferred because of a temperature difference (Bulgarian: пренасяне на топлина, meaning heat transfer)
  2. 3. The energy transfer pathway via electromagnetic waves; it requires no direct contact (German: Strahlung)
  3. 5. A rapid back-and-forth movement around a fixed point, important in particle energy transfer (Bulgarian: вибрация)
  4. 8. The full range of electromagnetic wavelengths and frequencies, or the range of visible light colours (Spanish: espectro visible)
  5. 10. To bounce radiant energy, light or sound away from a surface rather than absorb it (Spanish: reflejar)
  6. 12. The number of complete wave cycles per second, measured in hertz (German: Frequenz)
  7. 13. The variable a scientist deliberately changes in an investigation
Down
  1. 2. To give off or release thermal radiation from a surface into its surroundings
  2. 4. To take in radiant energy rather than reflect or transmit it (Spanish: absorber)
  3. 6. A measure related to the average kinetic energy of particles in a substance (German: Temperatur)
  4. 7. To spread light or radiation in different directions, as translucent materials can do (German: streuen, meaning to scatter)
  5. 9. Electromagnetic waves just beyond the red end of visible light, often associated with thermal radiation (Bulgarian: инфрачервени лъчи)
  6. 11. The SI unit used to measure energy and work