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2) Consider the separation of singly charged ions of U-238 and U-235 isotopes with mass spectograph. Due to some technical reasons, total ion current is limited by Imax=100 mA (this is close to a real number). Find how many mass spectrogphs, N, are needed to produce a critical mass, Mcrit=47 kg, of U-235 for T=100 days. Assume that the separation goes non-stop and recall that the fraction of U-235 in natural uranium is $235 = 0.7%. (20 points). ==