Across
- 4. the rate at which speed changes
- 8. sound waves with frequencies too high for humans to hear
- 9. the opposition to the flow of electric current
Down
- 1. rate at which work is done or energy is transferred
- 2. rays fast electrons released during radioactive decay
- 3. quantity of matter in an object
- 5. material that allows electricity to flow through
- 6. fundamental quantity measured in seconds
- 7. a thin strand of glass or plastic that transmits light signals for fast communication