Practice Quiz

Praxis II Physics Content Knowledge Exam Prep - Question List

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51.
Which of the following describes the primary significance of Rutherford's alpha-scattering experiments?
  1. They developed the concept of the half-life of a radioactive element.
  2. They created new radioactive isotopes by nuclear bombardment.
  3. They changed one atomic element into another through nuclear reactions.
  4. They demonstrated the existence of a small, dense, positively charged atomic nucleus.
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52.
Which of the following is one of Einstein's postulates of special relativity?
  1. Events that are simultaneous for one observer are not simultaneous for another observer in motion relative to the first.
  2. The energy of a photon is directly proportional to the frequency of the light.
  3. The momentum of an object approaches infinity as its speed approaches that of light.
  4. The speed of light in a vacuum has the same value in all inertial reference frames.
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53.
Which of the following is a significant advantage of using radioactive tracers in nuclear medicine?
  1. The radiation passes through the less dense matter such as skin and muscle and is absorbed by denser material such as bone.
  2. The physiological function of organs can be studied by following the movement of a radioisotope through the organ.
  3. The radioactive tracers emit high-energy particles that can be used to destroy malignant tumors.
  4. No ionization energy is released during the use of tracers since the imaging equipment measures the perturbed magnetic field of the water molecules in the body.
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