Proton (P) and electron (e) will have same de-Broglie wavelength when the ratio of their momentum is (assume, m p = 1849 m e )
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A
The De Broglie wavelength is 
The momentum is given by p = mv
The momentum of proton is p p = m p v p
The momentum of electron is p' = m e v e
Since h is the Planck's constant and it is given that both wavelengths are same, i.e.
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