Question
Obtain the Ohm's law $j=\sigma$ E. Using this relation, establish the relation $V=I R$. What are ohmic and non-ohmic devices? Explain by giving examples.
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The nucleus $^{235}_{92}\text{Y},$ initially at rest, decays into $^{231}_{90}\text{X}$ by emitting an $\alpha-$particle
$^{235}_{92}\text{Y}\xrightarrow{ \ \ \ \ \ \ \ \ } \ ^{231}_{90}\text{X}+ \ ^4_2\text{He}+\text{energy}.$
The binding energies per nucleon of the parent nucleus, the daughter nucleus and $\alpha-$particle are $7.8\ MeV, 7.835\ MeV$ and $7.07\ MeV,$ respectively. Assuming the daughter nucleus to be formed in the unexcited state and neglecting its share in the energy of the reaction, find the speed of the emitted $\alpha-$particle. $($Mass of $\alpha-$ particle $= 6.68 \times 10^{–27}kg).$
→$^{235}_{92}\text{Y}\xrightarrow{ \ \ \ \ \ \ \ \ } \ ^{231}_{90}\text{X}+ \ ^4_2\text{He}+\text{energy}.$
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