Uranium-235 Releases an Average of 2

question 82

Multiple Choice

Uranium-235 releases an average of 2.5 neutrons per fission,while plutonium-239 releases an average of 2.7 neutrons per fission.Which of these elements might you therefore expect to have the smaller critical mass?

• A)plutonium-239
• B)uranium-235
• C)The number of neutrons per fission will not effect the size of critical mass.
• D)The critical mass of these elements cannot be determined from only the number of neutrons per fission.

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Definitions:

Egas Moniz

A Portuguese neurologist best known for pioneering the prefrontal lobotomy as a treatment for mental disorders, and awarded the Nobel Prize in Physiology or Medicine in 1949.

Mental Asylum

Historically, an institution providing care and treatment to individuals with mental illness, now more commonly referred to as psychiatric hospitals.

Egypt

A country in northeastern Africa known for its ancient civilization, pyramids, and the Nile River, with a rich historical and cultural heritage.

Greece

A country in southeastern Europe known for its rich history in philosophy, art, science, and democracy, as well as its ancient ruins and scenic landscapes.