For an elastic, isotropic collision in cm-system occurring with a heavy nucleus a) perform the limited expansion of ε and ξ in powers of 1/a; and b) evaluate the error in ξ when the exponential law for the gain in lethargy between 0 and ε is replaced by a uniform law between the same limits. this approximation is sometimes made, for instance, when calculating the strength of resonant absorption by heavy nuclides

The answer is as follows in the photo

stands for electromotive force and it is measured in volts. despite its name, it is not actually the force in the sense of being a "pushing" or "pulling" (not measured in newtons).an equation that relates emf,  ℰ,  to a battery's terminal voltage, v, current, i, and internal resistance, r, is    ℰ = v + irin this case, the emf can be interpreted as a voltage—a difference in electric potential.i would not say that it would be considered an energy. if emf can be defined as the energy/work per a unit charge from a battery or other electric source, then it is not strictly energy.

The correct answer should be b let me know if i’m wrong

Hello,your answer would be iron! plz mark me brainliest! hope this !