What is the optimum fuel-to-moderator ratio of a homogeneous mixture of 235U and (a) light water,…

What is the
optimum fuel-to-moderator ratio of a homogeneous mixture of 235U and (a) light
water, (b) heavy water, (c) beryllium, and (d) graphite to produce a mixture
with the maximum k^l Data: the thermal (0.0253 eV) absorption cross sections
for water, heavy water, beryllium and carbon are 0.664, 0.00133, 0.0092 and
0.0034 b per molecule or atom, respectively.