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![[Post New]](/templates/default/images/icon_minipost_new.gif) 3 Apr 2008 14:08:21 IST
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X (220) -> Y ( 216 ) + alpha ( 4 )
nucleus of mass number 220, initially at rest. So conservation of momentum gives
0 = 216 v1 + 4 v2
v1 = - 4v2 / 216 = -v2 / 54
now conservation of energy gives
( 1/2) m1 v12 + ( 1/2) m2 v22 = Q
108 v12 + 2 v2 2 = 5.5 mev
108 ( -v2 / 54 )2 + 2 v2 2 = 5.5 mev
2 v2 2 = 5.4 Mev
** edited.
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it is not important where u stand, but in which direction u are moving |
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