The ionisation energy of the hydrogen atom is given to be \( 13.6 \mathrm{eV} \). A photon falls...

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The ionisation energy of the hydrogen atom is given to be \( 13.6 \mathrm{eV} \). A photon falls on a hydrogen atom which is initially in the ground state and excites it to the \( (n=4) \) state. Calculate the wavelength (in \( \AA \) ) of the photon.
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