Physics crossword

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Across
  1. 3. The time it takes for half of radioactive material to decay
  2. 7. The displacement of the restpoint
  3. 8. Heat transfer through contact
  4. 10. Used to measure potential difference
  5. 11. Used to measure current
  6. 12. An atom with a charge
Down
  1. 1. Heat transfer between liquids and gases
  2. 2. Atom with a different number of neutrons
  3. 4. Type of radioactive decay
  4. 5. Measure of charge
  5. 6. Heat transfer through infrared
  6. 9. Measures resistance