Verified Solution • 2025–26 Session moderate

QNEET-2017-Ph-968: NEET 2017 Physics - Class 12 NEET-2017-Ph-968 Solution: Radioactive material 'A' has decay constant '\(8 \)' and…

Radioactive material 'A' has decay constant '8λ8\lambda' and material 'B' has decay constant 'λ\lambda'. Initially they have same number of nuclei. After what time the ratio of number of nuclei of material 'B' to that 'A' will be e? 17λ\frac{1}{7\lambda} 18λ\frac{1}{8\lambda} 19λ\frac{1}{9\lambda} 1λ\frac{1}{\lambda}

Multiple Choice Options

  • A 17λ{1 \over {7\lambda }} 7 _ 1 _
  • B 18λ{1 \over {8\lambda }} 8 _ 1 _
  • C 19λ{1 \over {9\lambda }} 9 _ 1 _
  • D 1λ{1 \over {\lambda }} _ 1 _

Step-by-Step Verified Solution

Ratio of number of nuclei N 1 N 2 = e _ 8 _ t e _ _ t = e _ 7 _ t According to question, e _ 7 _ t = 1 e _ t = 1 7 _

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