A.
We know that
E = h*f = hc/lambda
lambda = hc/E
1 eV = 1.6*10^-19 J
using given values:
lambda = 6.626*10^-34*3*10^8/(0.563*10^6*1.6*10^-19)
lambda = 2.206*10^-12 m = 2.21 pm
B.
d(lambda) = h*(1 - cos phi)/(me*c)
d(lambda) = 6.626*10^-34*(1 - cos 61.6 deg)/(9.31*10^-31*3*10^8)
= 1.244*10^-12 m = 1.244 pm
Now,
d(lambda) = lambda1 - lambda
lambda1 = 1.244 + 2.21 = 3.454 pm
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