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clear
//
//
//
//Variable declaration
h=6.62*10^-34; //planck's constant(J-sec)
m=9.1*10^-31; //mass of electron(kg)
mp=1836*m; //mass of photon(kg)
c=3*10^8; //velocity of light(m/sec)
e=1.6*10^-19; //charge of electron(c)
//Calculations
E=m*c^2; //energy(J)
v=sqrt(2*E/mp); //velocity(m/sec)
lamda=h*10^10/(mp*v); //de-broglie wavelength of proton(angstrom)
//Result
printf("\n de-broglie wavelength of proton is %0.4f angstrom",lamda)
printf("\n answer in the book is wrong")
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