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////Given
V=100 //ev
a=10 //degree
n=1
//Calculation
//
v=12.3/(sqrt(V)) //De broglie wavelength
d=v/(2*sin(a*3.14/180.0))
n=(2*d)/v
//Result
printf("\n (a) Spacing between the crystal plane is %0.2f A",d)
printf("\n (b) Peaks in the interference pattern is %0.2f ",n)
printf("\n the largest possible value of n is 5")
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