Which of the following statements is correct?

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(A) Radioactive decay is a spontaneous and continuous process that cannot be controlled by any physical or chemical means. Nuclear fission is a proces

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

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(A) Radioactive decay is a spontaneous and continuous process that cannot be controlled by any physical or chemical means. Nuclear fission is a process that can be controlled in a nuclear reactor using control rods to absorb excess neutrons. Therefore,the statement that the rate of radioactive decay cannot be controlled but that of nuclear fission can be controlled is correct. Nuclear forces are charge-independent. Nuclei with the same number of neutrons are called isotones,not isobars. The de Broglie wavelength formula $\lambda = h/p$ applies to both matter waves and photons (where $p = E/c$ for photons).

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