Natural uranium consists of .^(235)U:...

Natural uranium consists of `.^(235)U`:

0.99

0.5

0.1

0.007

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Which of the following is correct regarding nuclear fission? (i) The process in which a heavy nucleus is broken into two nearly equal fragments, is called ‘Nuclear Fission’ (ii) Nautral uranium has two istopes, ._(92)U^(238) and ._(92)U^(235) in the ratio 1 : 0.07 . the fission of U^(235) takes place only by fats neutrons, whereast that of U^(235) is possible by slow neutrons (iii) One of the reaction for fission of U^(235) ._(92)^(236)U+._(0)^(1)nrarr._(92)^(236)Urarr._(52)^(144)Ba+._(36)^(89)Kr+3_(0)^(1)n + energy (iv) In the fission of one U^(235) nucleus, about 200MeV of enegry of obtained. Most of this enegry is obtained from of K.E. of fragments obtained by fission, the rest of obained as K.E. of emitted neutrons, gamma -rays, heat and light radiation

Natural uranium is a mixture of three isotopes _92^234U , _92^234U , _92^235U and _92^238U with mass percentage 0.01%, 0.71% and 99.28% respectively. The half-life of three isotopes are 2.5xx10^5yr , 7.1xx10^8yr and 4.5xx10^9yr respectively. Determine the share of radioactivity of each isotope into the total activity of the natural uranium.

Calculate the radius and density of ._(92)^(235)U

Naturally occurring uranium contains ------- isotopes

An explosion of atomic bomb releases an energy of 7.6xx10^(13)J . If 200 MeV energy is released on fission of one .^(235)U atom calculate (i) the number of uranium atoms undergoing fission. (ii) the mass of uranium used in the atom bomb

The number of neutrons that are released on an average during the fission of U^(235) nucleus is

OP TANDON-RADIOACTIVITY AND NUCLEAR TRANSFORMATION -OBJ - A

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