A nucleus of In–116 decays into a stable nucleus of Sn–116. It decays by emission followed by the emission of –radiation as the Sn–116 nucleus de–excited into its ground state.
The In–116 nucleus can decay to one of three excited states of the Sn–116 nucleus as shown in the diagram below. The energies of the excited states are shown relative to the ground state.
How many discrete wavelengths would be emitted and what is the longest wavelength of the emitted –radiation?
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Number of discrete wavelengths
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Longest wavelength emitted / m
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A
B
C
D
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6
6
3
3
|
4.6 × 10–12
8.9 × 10–12
8.9 × 10–12
4.6 × 10–12
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