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clear
//
//
//
//Variable declaration
h=6.625*10^-34; //planck's constant(J-sec)
m=1.675*10^-27; //mass of neutron(kg)
e=1.6*10^-19; //charge of electron(c)
E=12.8*10^6; //energy of neutron(eV)
//Calculations
v=sqrt(2*E*e/m); //velocity(m/sec)
lamda=h/(m*v); //de-broglie wavelength of neutron(m)
//Result
printf("\n de-broglie wavelength of neutron is %0.3f *10^-15 m",lamda*10^15)
printf("\n answer in the book is wrong")
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