Across
- 4. anything with a mass
- 5. the time it takes for half of the radioactive material to decay
- 8. heat transfered through touch within solids
- 12. can be longitudinal or transverse
Down
- 1. energy gained or lossed by charge
- 2. uses infrared to transfer heat and doesn't need particles
- 3. adds energy to something
- 6. an atom with any charge
- 7. speed increasing
- 9. the speed at which something decomposing
- 10. liquids and gases rise when less dense
- 11. has a different number of neutrons