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First Order Reaction

consider the ...

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consider the following radioactive decay {}^{90}X\xrightarrow{β-emission}{}^{90}Y\xrightarrow{β-emission}Z If half life of {}^{90}Y is 73 hours and that of {}^{90}X is 20 years,then the amount of {}^{90}Y in equilibrium with 1g of {}^{90}X i

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