Chapter 4 review

3. ray- come from inside the nucleus of a radioactive atom, and they are emitted spontaneously from radioactive material.
7. from one crest to another
13. opposite is true for x-rays: behave more like particles than waves.
14. Is a phenomenon when wavelength increases, energy behaves more wave like
15. - Energy radiated through space accompanied by electrical and magnetic fields.
17. -bone ~ absorbs x-rays.
19. - No light passes through
22. characterized by the energy contained in the photon. X-ray photon has more E than that of a light or RF photon.
23. square law- Relates beam intensity to distance from the source (focal spot source of x-rays)
24. - partial absorption of energy
25. .Number of cycles passing any given point

1. soft tissue ~allows transmission of x-rays with decreased intensity, some change in direction.
2. in a straight line.
4. Smallest quantity of any type of electromagnetic radiation
5. - The smallest amount of energy that can be emitted or absorbed in the from of electromagnetic radiation is known as quantum .
6. Responsible for producing images.
8. occupies the smallest segment of the electromagnetic spectrum, but the only portion we can sense directly
9. and magnetic fields are 90-degrees to each other.
10. of varying degrees of absorption of the useful x-ray beam as it passes through the tissues of the body.
11. Smallest bundle of energy traveling through space at the speed of light
12. half of the range from crest to valley
13. energy of the radiation absorbed or emitted is directly proportional to the frequency of the radiation.
16. no mass.
18. intensity is INVERSELY related to the square of the distance from the source
20. - describes radio waves in terms of frequency, such as television or radio stations. RF has low energy and long wavelengths. Very short wavelength RF is microwave radiation
21. photons, travel @ the speed of light and either exist with a velocity of speed of light or do not exist at all.