Which of the following is not a fissible material?

^{235} U

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^{238} U

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^{233} U

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^{239} P u

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Solution

The correct option is A $^{238} U$
$∙$ Uranium 238 is not fission able by thermal neutrons, but it can undergo fission from last or high energy neutrons. Hence it is not fissible, but it is fissionable.
$∙$ By definition, fissible material can sustain a chain reaction with neutrons of any energy.

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P u^{239}

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M (^{235} U) = 235.0439 a m u

M (n) = 1.0087 a m u

M (^{238} U) = 238.0508 a m u

M (^{236} U) = 236.0456 a m u

M (^{239} U) = 239.0543 a m u

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