Across
- 3. Third letter in the Greek alphabet
- 4. Second letter in the Greek alphabet
- 6. particle A photon
- 8. Involves half the time for a substance to fall
- 10. Particle that is irreducible
- 11. to liquify or melt by heat
- 12. Quantum of electromagnetic energy
Down
- 1. disturbance or oscillation
- 2. emission of energy by rays
- 5. First letter in the Greek Alphabet
- 7. To disintegrate or diminish
- 9. Process of splitting into parts