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The electron energy in hydrogen atom is given by En = (- 2.18 × 10-18) / n2 J. Calculate the energy required to remove an electron completely from the n = 2 orbit. What is the longest wavelength of light in cm that can be used to cause this transition?

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Step I.

Calculation of energy required 

The energy required is the difference in the energy when the electron jumps from orbit with n = ∞ to orbit with n = 2. 

The energy required (∆E) = E - E2

Step II. 

Calculation of the longest wavelength of light in cm used to cause the transition 

∆E = hv = hc / λ.

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