Dual Nature Of Radiation

Kinetic energy of a proton is equal to energy '\(E\)' of a photon. Let '\(\lambda_1\)' be the de-Broglie wavelength of proton and '\(\lambda_2\)' is the wavelength of photon. If \(\frac{\lambda_1}{\lambda_2} \alpha E^n\), then the value of '\(n\)' is