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

The  wavelength is    

Explanation:

From the question we are told that

    The energy required is  

This energy needed in form of a photon  can be mathematically represented as

where h is the Planck constant with a value  

and  c is the speed of light which is  

 substituting values      

= >      

b is the correct answer

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