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A sample has two isotopes A and B having...

A sample has two isotopes `A` and `B` having masses `50 g` and `30 g`, respectively. `A` is radioactive and `B` is stable.` A` decays to `A'` by emitting `alpha`-particles. The half-life of `A` is `2 h`. Find the mass of the sample after `4h `and number of `alpha`-particles emitted.

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The correct Answer is:
`2`
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