A proton and an electron, both at rest initially, combine to form a H-atom in ground state. A si...

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A proton and an electron, both at rest initially, combine to form a H-atom in ground state. A single photon is emitted in this process. Find the wavelength (in \( \mathrm{nm} \) ) of this photon. (use : \( \mathrm{hc}=1237.6 \mathrm{ev} \times \mathrm{nm} \) )
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