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Across 2. a source to give electrons energy 5. Electrons come back to their energy levels in ______ 7. Frequency and wavelength are ______ porportional 10. An electron can be in more than one ____ at the same time 11. for fast moving electrons it is fundamently impossibel to study thier momentum and ________ at the same time 12. an impelling force or strength(keeps electrons moving) 13. electrons can move in ________ 15. example of invisible light waves(hint: use them to cook food) 18. how many waves per second 20. True or False: The speed of light varies. 23. waves with ___ frequency have long wavelengths 25. the peak of a wave 26. waves with short wavelengths have ____ frequency 31. _____ waves are the waves with the longest wavelengths on the electromagnetic spectrum 33. Electrons may leave energy levels but _____ when they are less excited 35. type of wpectrum showing the wavelengths and frequencies of types of light waves 36. travels in waves and made of photons 37. Best you can do with quantum mechanics is predict the chance of an outcome or 42. speed of light = (lambda)(____) 44. The distance between two crests or troughs of waves 46. electrons can behave as this 47. in the electromagnetic spectrum, light with short wavelength is classified as this 49. an electron is unexcited: _____ level 50. an electron is this type of particle

Down 1. light is this 3. only a small portion of light on the electromagnetic spectrum is visible to the ______ ___ 4. a particle that behaves like a wave 6. when an electron collides with another electron, the electron is ________. 8. trying to observe an electron will cause it to change its _______ 9. in energy levels, _______ and energy varies. 14. electrons near the center of the atom travel around this 16. in the double slit expierment, electrons made an _________ pattern when they were not being observed. 17. the _____ ____ expierment shows how electrons' behaivor changes when being observed 19. deals with theory of structure and behaivor of atoms and molecules 21. height of a crest 22. repeated circular path 24. electrons behave as particles when the are _______, according to the double slit expierment 27. unit of frequency 28. 3.00 x 10^8 meters per second 29. in the equation e=hf, h is planck's _______. 30. example from the electromagnetic spectrum of high frequency light waves (hint: often used in hopitals) 32. waves are measured crest to crest or_____ to ______ 34. The rate at which light travels is 186,000 _____ per second. 38. wavelength is measured in 39. In the equation E=hf, E stands for 40. wavelength is represented by this greek letter 41. electrons near the center of the atom travel very _______ 43. 6.626 x 10^-34 is ______'s constant 45. looking for an electron is a way to give it 48. electrons also can behave as this