Which Has the Smaller Critical Mass; U-235 That Releases 2

question 61

Multiple Choice

Which has the smaller critical mass; U-235 that releases 2.5 neutrons per fission, or Pu-239 that releases 2.7 neutrons per fission?

• A)U-235
• B)Pu-239
• C)both would have the same critical mass.

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