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

question 56

Multiple Choice

Which element 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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