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Question

Initially the nucleus of radium – 226 is at rest. It decays due to which and a particle and the nucleus of radon are created. The released energy during the decay is 4.87 Mev, which appears as the kinetic energy of the two resulted particles. [mα=4.002amu,mRn=222.017 amu]

Kinetic energies of particle & radon nucleus are respectively


A

0.09 Mev, 4.08 Mev

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B

4.78 Mev, 0.09Mev

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C

4.08 Mev, 0.09 Mev

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D

3.68 Mev, 0.08 Mev

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Solution

The correct options are
C

4.08 Mev, 0.09 Mev


D

3.68 Mev, 0.08 Mev


P=mv and
P22m=12mV2Ea=P22mEradon=P22M
Also
P22m+P22M=ΔEP=2ΔEmMm+Mm=4.002mu,M=222.017mum=6.64×1027 kg


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