1.

An alpha-particle is emitted by U238 nucleus with a speed of \[\text{1}.\text{5 x 1}{{0}^{\text{7}}}\] m/sec. The recoil speed of the remaining nucleus will be

A.  \[\text{2}.\text{4 x 1}{{0}^{\text{5}}}\text{ m}/\text{sec}\]  
B.  \[0.\text{24 x 1}{{0}^{\text{5}}}\text{ m}/\text{sec}\]
C.  \[\text{24 x 1}{{0}^{\text{5}}}\text{ m}/\text{sec}\]
D.  \[\text{245 x 1}{{0}^{\text{5}}}\text{ m}/\text{sec}\]
Answer» B.  \[0.\text{24 x 1}{{0}^{\text{5}}}\text{ m}/\text{sec}\]


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