a nucleus of 210
Po
84
originally at rest emit alpha particle with speed v .What is the recoil speed of the daughter nucleus?

The mass of polonium=210The mass of daughter nucleus after α particle is emitted=210-4=206.Initial momentum=0Let speed of daughter nucleus be v'.Applying law of conservation of momentum, we get,     0 = 206 v'+4 vor    v' =- 4 v/206=-2 v/103.

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