Which of the following statements is correct?

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(B) $1$. Isobars are nuclei with the same mass number $(A)$ but different atomic numbers $(Z)$. Nuclei with the same number of neutrons are called iso

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The rate of radioactive decay cannot be controlled,but nuclear fission can be controlled.

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(B) $1$. Isobars are nuclei with the same mass number $(A)$ but different atomic numbers $(Z)$. Nuclei with the same number of neutrons are called isotones. Thus,option $A$ is incorrect.$2$. Radioactive decay is a spontaneous process that cannot be influenced by external factors like temperature or pressure. Nuclear fission in a reactor is a controlled chain reaction. Thus,option $B$ is correct.$3$. Nuclear forces are short-range,strongly attractive,and charge-independent (they act equally between proton-proton,neutron-neutron,and proton-neutron). Thus,option $C$ is incorrect.$4$. The de Broglie wavelength $\lambda = h/p$ is applicable to both matter particles and photons (where $p = E/c$). Thus,option $D$ is incorrect.

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