DANB RHS EXAM - study guide questions with 100% correct answers

Professor Wilhelm Roentgen :___. a)advocated radiology in the u.s b)exposed the first radiographs in the u.s c)discovered the x-ray d)employed the first dental auxiliary in the united states c Digital radiography utilizes the following approach : a) filmless radiographic computer imaging system b) electronically charged plated imaging system c) non-ionizing radio frequency imaging system d) none of the above a A form of energy is : a) heat b) light c) electricity d) x-radiation e) all of the above e Photons are described as : a)bundles of energy b) dental film mounts c) electrically neutral particles d) negatively charged atomic particles a Limited Penetration, long wavelength radiation is known as : a) short wavelengths b) hard radiation c) soft radiation d) desirable wavelengths c Background Radiation originates from: a)enviornment b) outerspace c) radionuclides d) terrestrail radiation e) all of the above e Ionizing Radiation produces ions when : a) radiation passes through the body tissues b) ions compress into the atmosphere c) isotopes flow freely on air d) none of the above a Common Characteristics of radiation are : a) wavelengths that determine the penetrating power of the energy b) forms of electromagnetic radiation c) the giving off of electrical fields at right angles to the path of travel d) straight lines that travel at 186,000 miles per second e) all of the above e Hard Radiation is considered to be : a) short wavelengths with great penetrating power. most desirable and capable of penetrating oral structures b) long wavelengths with limited penetrating power. unsuitable for exposing radiographs a An electron is defined as : a) anything that occupies space and has mass b) electrically neutral tiny particle c) center of the atom d) negatively charged atomic particle d Penumbra is defined as : a) magnification of an object b) diverging xrays c) distortion of the shape of an image d) fuzzy outline of a radiographic image d What are the properties of electromagnetic radiation? a) travels at the speed of light b) no electrical charge and no mass or weight c) measurable energies d) a & b e) all of the above e Ionizing types of radiation include : a) gamma rays b) cosmic rays c) xrays d) only a & b e) all of the above e X-rays are categorized in the electromagnetic spectrum according to their : a) milliliters b) seconds c) liters d) wavelengths d The measurement unit of the number of oscillations per second of electromagnetic radiation is known as : a) crest b) wavelength c) bremsstrahlung d) frequency d Xrays charastically : a) travel in waves b) are invisible c) have no mass d) all of the above d A unit measuring ionization in the air is known as : a) coulomb per kilogram b) gray c) sievert d) anstorm a A unit measuring the effect of x-rays and tissues is defined as : a) rad b) rem c) roentgen d) angstrom b X-rays originate when components in the tube are heated and free electrons are propelled at high speeds toward the : a) cathode b) electrode c) focusing cup d) tungsten target d Dense structures such as bone and enamel a) absorb more x-rays b) absorb less x-rays c) appear radiopaque d) appear radiolucent e) a&c f) b&d e