The `alpha` particle faces a coulomb barrier .A neutron being uncharged faces no such barrier .Why does the nucleus `_(92)U^(238)` not decay spontaneously by emitting a neutron?

What are the number of protons and the number of neutrons in a nucleus of U^(238)_92 ?

How many alpha and eta - particles are emitted ,when uranium nucleus (_(92)U^(238)) decays to lead (_(82)Pb^(206)) ?

How many alpha - and beta - particles are emitted, when _(92)U^(238) decays to _(90) Th^(230) ?

The question given below consist of an assertion (A) and a reason ( R). Use the following key to choose the appropriate answer to these questions from the codes (a), (b), ( c) and (d) given below: (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is NOT the correct explanation of A. (c) A is true but R is false. (d) A is false and R is also false. Assertion: Nucleus of the atom does not contain electrons, yet it emits beta -particles in the form of electrons. Reason: In the nucleus, protons and neutrons exchange mesons frequently.

The nucleus of an atom of ._(92)Y^(235) initially at rest decays by emitting an alpha particle. The binding energy per nucleon of parent and dougther nuclei are 7.8MeV and 7.835MeV respectively and that of alpha particles is 7.07MeV//"nucleon". Assuming the dougther nucleus to be formed in the unexcited state and neglecting its share of energy in the reaction, calculate speed of emitted alpha particle. Take mass of alpha particle to be 6.68xx10^(-27)kg .

A nucleus at rest undergoes a decay emitting an alpha -particle of de-broglie wavelength lambda = 5.76 xx 10^(-15) m . The mass of daughter nucleus is 223.40 amu and that of alpha-particle is 4.002 a.m.u.detrmine the total kinetic energy in the final state.Hence,obtain teh mass of the parent nucleus in a.m.u. Given that 1 a.m.u.=931.470 MeV .

Each question contains STATEMENTS-1 (Assertion) and STATEMENT -2 (Reason). Examine the statements carefully and mark the correct answer according to the instructions given below: STATEMENT-1: Nucleus does not contain fee electrons, yet it emit beta-particles STATEMENT-2: At high n/p ratio, one neutron supposed to give 1 proton and 1 e^(-)(beta) .

Consider the fission of "_92^238U 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 "_58^140Ce and "_44^99Ru . Calculate Q for this fission process. The relevant atomic and particle masses are m( "_92^238U ) =238.05079 u m( "_58^140Ce ) =139.90543 u m( "_44^99Ru ) = 98.90594 u

Does the ratio of neutrons to protons in a nucleus increase, decrease or remain the same after the emission of alpha-particl es .

A neutron is abosorbed by "_3^6Li nucleus with the subsequent emission of an alpha-particl e . Calculate the energy released in MeV in this reaction given "_3^6Li =6.015126 u, mass (neutron)=1.0086654 u mass (alpha)=4.0026044 u and mass (triton)=3.0100000u. Take 1u=931 MeV//c^2 .