Across
- 4. beyond the violet in the spectrum
- 10. waves carry very little energy
- 11. the visual and especially tactile quality of a surface
- 12. light and all forms of electromagnetic radiation travel in a vacuum,
- 14. vibrations that travel though the air
- 15. how high or low a sound appears
- 16. change of direction of a ray of light, sound, heat,
- 18. passing through the earth's atmosphere; a shooting star or bolide.
- 22. the rubbing of the surface of one body against that of another.
- 25. an object or substance with respect to light reflected by the object
- 27. wave that travels parallel
- 28. the sun together with all the planets and other bodies that revolve around it
- 30. a celestial body moving about the sun
- 31. revolving around a central axis, line, or point
- 33. rays that stream of gamma radiation
Down
- 1. having hardness and rigidity but little tensile
- 2. highest part of a transverse wave
- 3. used extensively for communication
- 5. the positively charged mass within an atom
- 6. one of the extremely small constituents of matter
- 7. a mass or quantity
- 8. unit for force
- 9. the smallest component of an element
- 13. substance that activates the sense of smell
- 17. deals with both visible and invisible light
- 19. unit for work
- 20. obscuration of the light of the moon
- 21. measured in hertz
- 23. the invisible spectrum
- 24. rate of change of position of a body in a specified direction.
- 26. a form of electromagnetic radiation
- 29. a substance, as a coating or polish, used to impart sheen or gloss
- 32. lowest part of a transverse wave