Which of the following statements is correct?

  • A
    $(A)$ Becquerel,who discovered natural radioactivity,belongs to France.
  • B
    $(B)$ Marconi,who discovered wireless telegraphy,was an American.
  • C
    $(C)$ Newton was an American,who discovered the laws of motion.
  • D
    $(D)$ Einstein belongs to England,who simplified the laws of photoelectric effects.

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In an $\alpha$-decay,the kinetic energy of the $\alpha$-particle is $48 \, MeV$ and the $Q$-value of the reaction is $50 \, MeV$. The mass number of the mother nucleus is: (Assume that the daughter nucleus is in the ground state)

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In the nuclear reaction $_{92}U^{238} \to _{Z}Th^{A} + _{2}He^{4}$,the values of $A$ and $Z$ are:

$A$ nucleus with $Z = 92$ emits the following in a sequence: $\alpha, \beta^-, \beta^-, \alpha, \alpha, \alpha, \alpha, \alpha, \beta^-, \beta^-, \alpha, \beta^+, \beta^+, \alpha$. The $Z$ of the resulting nucleus is

After the decay of a single $\beta$ particle,the parent and daughter nuclei are

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