An Energy of 13

question 49

Multiple Choice

An energy of 13.6 eV is needed to ionise an electron from the ground state of a hydrogen atom.Selecting the longest wavelength that will work from those given below, what wavelength is needed if a photon accomplishes this task?

• A)60 nm
• B)80 nm
• C)70 nm
• D)90 nm
• E)40 nm

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