1.

If U^(238) nucleus at rest decays by emitting an alpha particle with a speed of V m/s. The recoil speed of residual nucleus in m//s is:

Answer»

`(-V)/(4)`
`-Vxx(4)/(238)`
`-Vxx(4)/(234)`
`V(4)/(234)`

SOLUTION :Initial momentum = FINAL momentum
`0 = m_(1)upsilon_(1) + m_(2)upsilon_(2)`
` 0 = (4 amu) V+ (234 amu) nu_(2)`
`impliesupsilon_(2)=(-4)/(234)Vm//s`
Hence the CORRECT choice is (d).


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