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The De Broglie Wavelength Essay Preview: The De Broglie Wavelength Report this essay PHYSICS 4, CHAPTER 3ADDITIONAL PROBLEMSWhat is the de Broglie wavelength of an electron with a kinetic energy of 120 eV?E=1/2mv^2 =>v=căn(2*E/m)=căn(2*(120*1.6*10^-19)/(9.1*10^-31)=6.5*10^6(m/s)Lamda=h/p=h/(mv)=(6.625*10^-34)/(9.1*10^-31*6.5*10^6)=112 pmANSWER: 112 pmThe wavelength of the yellow spectral emission line of sodium is 590 nm. At what kinetic energy would an electron.