Physics Crossword 7

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Across
  1. 3. quark character can only change in the ____ interaction (4)
  2. 6. reflected sound waves (6)
  3. 7. the positive nucleon (6)
  4. 9. the total charge of an atom (4)
  5. 11. all electromagnetic waves travel at the same ____ (5)
  6. 12. ____ velocity: the maximum speed of a falling object – its weight and frictional forces are balanced (8)
  7. 14. ____ waves can be used for medical imaging (10)
  8. 15. opposite charges ____ (7)
  9. 16. he was the first to propose that stars were destined to collapse at the end of their lives (13)
  10. 17. larger planets in our solar system are primarily made of ____ (3)
  11. 18. this wire could give you an electric shock (4)
  12. 20. Newton’s ____ law: when 2 objects interact, they exert equal and opposite forces on each other (5)
  13. 22. ____ production: a photon is converted into an equal amount of matter and antimatter (4)
  14. 23. they are generally less dense than solids (5)
  15. 24. the strength of a magnet is directly proportional to the ____ from the magnet (8)
  16. 25. the smallest planet in our solar system (7)
  17. 26. type of wave produced by earthquakes (7)
  18. 29. the hand you use to do Fleming’s rule (4)
  19. 30. light appears ____ shifted from galaxies which are moving away from Earth (3)
Down
  1. 1. the material that slows down the neutrons during nuclear fission so that they are more likely to be absorbed into a nearby fuel rod (8)
  2. 2. one of the colours of the earth wire (6)
  3. 4. one of the A’s in NASA (11)
  4. 5. the sun is orbited by ____ planets (5)
  5. 8. all waves can be ____ (9)
  6. 10. our current model of the solar system is ____ (12)
  7. 13. the universe is ____ (9)
  8. 19. voltmeters are connected in ____ (8)
  9. 21. a main ____ star is in a long period of stability (8)
  10. 27. the rovers Curiosity and Perseverance were sent to study this planet (4)
  11. 28. a type of lens (6)