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clc//
//
//
//Variable declaration
m=9.1*10^-31; //mass of electron(kg)
h=6.626*10^-34; //planck's constant
E=2000*1.6*10^-19; //energy(J)
//Calculation
lamda=h/sqrt(2*m*E); //de broglie wavelength(m)
//Result
printf("\n de broglie wavelength is %0.4f nm",lamda*10^9)
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