A radioactive nucleus of mass number A ,...

A radioactive nucleus of mass number A , initially at rest , emits an `alpha ` -particle with a speed v. the recoil speed of the daughter nucleus will be

` (2v)/( A-4) `

` (2v)/( A+4) `

` (4v)/( A-4) `

` (4v)/( A+4) `

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WB JEE PREVIOUS YEAR PAPER-QUESTION PAPER 2011-PHYSICS

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