The isotopic mass of ""(92)^(238)U is 23...

The isotopic mass of `""_(92)^(238)U` is 238.125 a.m.u. Its packing fraction is :

5.25

0.125

12.5

1.25

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One a.m.u. stands for

If the mass defect of ""_(4)^(9)X is a.m.u., then binding energy per nucleon is (1 a.m.u. = 931.5 MeV):

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We are given the following atomic masses: ""_(92)^(238) U = 238.05079 u " " _(2)^(4)He = 4.00260 u ""_(90)^(234)Th = 234.04363 u" "_(1)^(1)H= 1.00783 u ""_(91)^(237)Pa = 237.05121 u Here the symbol Pa is for the element protactinium (Z = 91). (a) Calculate the energy released during the alpha decay of ""_(92)^(238)U . (b) Show that ""_(92)^(238)U can not spontaneously emit a proton.

In the transformation of ""_(92)^(238)U to ""_(92)^(234)U , if one emission is an alpha -particle, what should be the other emission ?

Consider the fission of ""_(92)^(238)U by fast neutrons. In one fission event, no neutrons are emitted and the final end products, after the beta decay of the primary fragments, are ""_(58)^(140)Ce and ""_(44)^(99)Ru . Calculate Q for this fission process. The relevant atomic and particle masses are m(""_(92)^(238)U) =238.05079 u m( ""_(58)^(140)Ce ) =139.90543 u m(""_(44)^(99)Ru ) = 98.90594 u

The half-life of ""_(92)^(238)U undergoing a-decay is 4.5 xx 10^9 years. What is the activity of 1g sample of ""_(92)^(238)U ?

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