Thermionic emission questions | form four Physics

(2207) Question Category: Short answers

A radioactive material is denoted by the symbol _{88}^{226}	extrm{X}. Write down the composition of the nucleus during the end of the following stages of disintegration.
(i) the emission of an alpha-particle.
(ii) the further emission of a beta-particle.
(iii) the further emission of a gamma radiation.

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(2212) Question Category: Short answers

The following represents part of the decay chain for thorium
_{90}^{232}	extrm{Th}
ightarrow _{88}^{228}	extrm{Ra}
ightarrow _{89}^{228}	extrm{Ac}
ightarrow _{90}^{228}	extrm{Th}
ightarrow _{88}^{224}	extrm{Ra}
What particles are emitted at each part of the chain?

Answer / Solution

UNSOLVED

(2215) Question Category: Short answers

A radioactive nucleus is denoted by the symbol  _{88}^{226}	extrm{X}. Write down the composition of
the nucleus at the end of the following stages of disintegration:
(i) emission of an alpha (alpha) particle
(ii) further emission of a beta (eta) particle
(iii) further emission of a gamma radiation.

Answer / Solution

UNSOLVED

(2216) Question Category: Short answers

Part of a certain nuclear decay series is represented by the following unbalanced
equations, in each stage only ONE type of a particle is emitted.
(i) _{90}^{232}	extrm{Th}
ightarrow _{88}^{228}	extrm{Ra}

(ii) _{88}^{228}	extrm{Ra}
ightarrow _{89}^{228}	extrm{Ac}

(iii) _{89}^{228}	extrm{Ac}
ightarrow _{90}^{228}	extrm{Th}

(iv) _{90}^{228}	extrm{Th}
ightarrow _{88}^{224}	extrm{Ra}
(a) Identify the type of particle emitted in each of the above stages.
(b) Write two pairs of isotopes from the above series.

Answer / Solution

UNSOLVED

(2217) Question Category: Short answers

Uranium _{92}^{238}	extrm{U} decays to Polonium _{84}^{222}	extrm{P} by α emission (at  each stage) via _{x}^{234}	extrm{Th},_{y}^{230}	extrm{Ra} and _{z}^{226}	extrm{Rn}. Following this process,_{84}^{222}	extrm{P} decays to _{86}^{q}	extrm{Rn} by β emission only. Write balanced equations of the stage by stage decay process from _{92}^{238}	extrm{U} to _{86}^{q}	extrm{Rn} and  hence determine the values of x, y, z and q.  Then  Name the isotopes and isobars obtained in the decay process shown above.

Answer / Solution

UNSOLVED


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