6. Reflectance and Transmittance at a Potential StepA beam of protons, each with kinetic energy 40 MeV, approaches a downward step potential of-30 MeV. (a) What fraction of the beam is reflected? (b) How does your answer change if theparticles are electrons?V (x)E = 40 MeVV=030 MeVXNow if the step is upward with = +100 MeV, (c) what fractions of the particles are reflectedfor? And what are the penetration depths into the barrier for (d) protons and (e) electrons?

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