2015 Med Phys I Lecture 3.2a PreTest Question Title * 1. Name: Question Title * 2. In deriving the equation for mass stopping power, we make the following assumptions to find the total energy transfer except Electrons are uniformly distributed The number of electrons depends on the volume of a spherical shell and electron density There is some bmax beyond which there is no energy transfer There is some bmin beyond which there is no energy transfer Question Title * 3. Which of the following would NOT cause an increase in the collisional stopping power? An increase in charge of the incident particle An increase in the velocity of the incident particle An increase in electron density of the stopping material An increase in the density of the stopping material Question Title * 4. Which statement is false in terms of describing heavy charged particles? The primary interaction is with orbital electrons The primary interaction is with the nucleus The heavy particles are not significantly deflected in a collision Question Title * 5. At a given incident particle energy, radiative energy loss in proton beams is _______ radiative energy loss in electron beams. Much greater than Greater than Less than Much less than Question Title * 6. Radiative energy loss in proton therapy is not a factor because protons are non-relativistic is not a factor because protons are so massive is a factor because protons are so massive is only a factor for energies around 100 MeV Question Title * 7. Are there any issues that are not clear to you at this time? Done