Physics Ncert Solutions Class 12th Nuclei Class 12th Physics

13.25 A source contains two phosphorous radio nuclides ${}_{15}^{32}P {, T}_{1 / 2}$ = 14.3d and ${}_{15}^{33}P, T_{1 / 2}$ = 25.3d. Initially, 10% of the decays come from ${}_{15}^{33}P$ . How long one must wait until 90% do so?

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Payal Gupta | Contributor-Level 10

9 months ago

13.25 Half life of ${}_{15}^{32}P {, T}_{1 / 2}$ = 14.3 days

Half life of ${}_{15}^{33}P, T_{1 / 2}$ = 25.3days and ${}_{15}^{33}P$ decay is 10% of the total amount of decay

The source has initially 10 % of ${}_{15}^{33}P$ nucleus and 90% of ${}_{15}^{32}P$ nucleus

Suppose after t days, the source has 10% of ${}_{15}^{32}P$ nucleus and 90% of ${}_{15}^{33}P$ nucleus

Initially:

Number of ${}_{15}^{33}P$ nucleus = N

Number of ${}_{15}^{32}P$ nucleus

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Physics Ncert Solutions Class 12th 2023

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