A nucleus disintegrates into two smaller parts, which have their velocities in the ratio $3: 2$. The ratio of their nuclear sizes will be $\left(\frac{x}{3}\right)^{\frac{1}{3}}$. The value of ' $x$ ' is :

  • [JEE MAIN 2023]
  • A

    $1$

  • B

    $2$

  • C

    $3$

  • D

    $4$

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  • [AIEEE 2004]

The mass number of a nucleus is equal to the number of