7.48 The scattering cross section for the scattering of electrons by a rare gas of krypton atoms exhibits a low-energy minimum at E ~ 0.9 V. Assuming that the diameter of the atomic well seen by the electrons is 1 Bohr radius, calculate its depth.

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Q: Ex. 1: Find the ratio of diameter of electron 1st Bohr orbit to that 4th bohr orbit.

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