LRA 211 Radio Physics Final Exam | Complete Q&A with Correct Solutions | A+ Verified | Updated 2025

LRA 211 Radio Physics Final Exam | Complete Q&A with Correct Solutions | A+ Verified | Updated 2025 1. Refers to those photons that are attenuated by the body and do not reach the image receptor - ANSWER absorption 2. This "lack" of exposure to the image receptor results - ANSWER lighter shades 3. Absorption depends on - ANSWER density 4. Body structures that readily absorb x-rays - ANSWER radiopaque 5. Less dense structures have a much lower probability of absorption and are said to be - ANSWER radiolucent 6. Latent image is - ANSWER invisible 7. Manifest image - ANSWER visible image after processing 8. Beam attenuation is affected by - ANSWER tissue thickness, atomic number, density 9. Increasing the quality of the beam - ANSWER decreases beam attenuation 10. Digital image quality is improved with a larger - ANSWER matrix size with small pixels 11. Digital image receptor vs film screeen - ANSWER film screen has limitation if over exposed must retake contributing to patient dose 12. Provides a numeric value indicating the level of radiation exposure to the digital image receptor. - ANSWER exposure indicator 13. Is a term associated with digital imaging and is used to describe the ability of the imaging system to distinguish between small objects that attenuate the x-ray beam similarly - ANSWER contrast resolution 14. What does window width control? - ANSWER contrast 15. Who is John Dalton - ANSWER created the atomic theory 16. Who is Rutherford? - ANSWER responsible for the solar system model of the atom 17. alpha particle - ANSWER consist of two protons and neutron 18. Whats an electron - ANSWER negatively charged particle 19. whats a proton - ANSWER positively charged particle 20. whats a neutron - ANSWER neutral charged particle 21. Which shell has the greatest binding energy? - ANSWER K shell 22. The atomic number represents what - ANSWER number of protons and electrons 23. Radiowaves are used for - ANSWER MRI 24. xrays and gamma rays are used for? - ANSWER radiology and nuclear medicine 25. How to measure wavelength - ANSWER crest to crest 26. How to measure frequency - ANSWER Hertz 27. Wavelength is measured in - ANSWER meters 28. Refers to the number of waves that pass a given point per second - ANSWER frequency 29. The maximum height of a wave - ANSWER amplitude 30. This removal of an electron from an atom - ANSWER ionization 31. Is an electron that is emitted from an unstable nucleus; it does not originate in an electron shell - ANSWER beta particles 32. What is inside the xray tube too help protect the housing? - ANSWER oil bath and cooling fans 33. How much leakage radiation is allowed per year - ANSWER 100mR 34. The protective housing is designed with what - ANSWER electric insulators and cushions 35. Negative side of xray tube - ANSWER cathode 36. Positive side of xray tube - ANSWER anode 37. Why is tungesten used as a target material? - ANSWER high atomic number 38. What is the anode disc made of? - ANSWER molybdenum and tungensten 39. What is an induction motor - ANSWER An AC motor that operates by using the magnetic field generated in the stater to induce current in the rotor 40. Glass envelope made with - ANSWER borosilicate glass 41. Order of electromagnetic spectrum - ANSWER radio-->microwave-->infared-->visible-->UV-->xray-->gamma ray 42. The smaller the focal spot - ANSWER sharper image 43. In the anode heel effect the beam on the anode side is - ANSWER less intense 44. It is better to positon what side of the patient on the anode side - ANSWER less dense side 45. Due to the anode effect which side gives off the most intensity - ANSWER cathode 46. Cathode filaments are made up of - ANSWER tungensten and thorium