Which one of the following is not correct?

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(D) Let us analyze each statement:$(i)$ In forward biased condition,the depletion layer width decreases,allowing current to flow; thus,a diode conduct

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Radioactive elements can undergo spontaneous fission.

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(D) Let us analyze each statement:$(i)$ In forward biased condition,the depletion layer width decreases,allowing current to flow; thus,a diode conducts. This is correct.(ii) The packing fraction is defined as $f = (M - A) / A$. $A$ smaller or negative packing fraction indicates higher stability of the nucleus. This is correct.(iii) Binding energy is the energy required to disassemble a nucleus into its constituent protons and neutrons,which is equivalent to the mass defect $\Delta m$ via Einstein's equation $E = \Delta m c^2$. This is correct.(iv) Spontaneous fission is a rare radioactive decay process that occurs only in very heavy nuclei (e.g.,$U-238$,$Cf-252$). It is not a general property of all radioactive elements. Therefore,the statement that radioactive elements (implying all) can undergo spontaneous fission is incorrect.

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