A researcher wishes to determine the binding energy of a newly discovered noble gas
PHYSICS · Multi-part · CBSE · Physics · Dual Nature of Radiation and Matter · Dual Nature of Radiation and Matter
Problem
A researcher wishes to determine the binding energy of a newly discovered noble gas. Preliminary absorption measurements suggest that photons with wavelengths shorter than 314nm are absorbed strongly, while longer wavelengths are not.
Assume the measurements were made with ground-state atoms and that the transition observed corresponds to direct ionization.
(a) Describe qualitatively how the observed cutoff in the absorption spectrum is related to the ionization process of the atoms.
(b) Without performing a numerical calculation, outline the steps required to compute the binding energy from the measured cutoff wavelength, identifying each physical quantity that would need to be determined or referenced.
(c) Discuss two possible experimental uncertainties or limitations that could cause the measured cutoff wavelength to differ from the true threshold for ionization, and explain how each would affect the inferred binding energy.