The debroglie wavelength is given by the formula I`ve mentioned below but since the velocity isnt given we`ll have to find it using formula given by Bohr v=2•2x10^6(Z|n)=2•2x10^6h=6•6x10^-34m=9•1x10^-31(KGS)Substitute all the values in (lambda)=h|mv to get the answerDone|