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+clear;
+clc;
+printf("\nEx2.7\n");
+//page no.-57
+//given
+m=1.66*10^-24;..........//mass of proton in gm
+e=4.8*10^-10;.............//charge in e.s.u.
+h=6.62*10^-27;.............//planck's constant in erg-sec
+E=1.6*10^-7;.............//energy in ergs
+//we knoe , E=m*v^2/2
+
+v=sqrt((2*E)/m);..........//velocity in m/s
+//By debroglie relationship
+
+lambda=h/sqrt(2*m*E)...........//wavelength in cm
+
+printf("\nwavelength is 9.08*10^-14 m\n");