Physics Crossword Puzzle

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Across
  1. 3. spreading of light
  2. 6. angle between central maximum and diffraction maximum
  3. 7. who constant of 1.097*10^-7 m^-1 was named after
  4. 9. nationality of JJ Balmer
  5. 10. volunteered his time to help us
  6. 11. element studied in this experiment
Down
  1. 1. mentioned in Song of Solomon
  2. 2. what all of us are for finishing physics
  3. 4. who gave the above and beyond
  4. 5. light spectrum detectable by human eye
  5. 8. means to scratch