Atoms And Nuclei Question 392

Question: Starting with a sample 66Cu,78 of pure decays into Zn in 15 minutes. The corresponding half-life is

Options:

A) 15 minutes

B) 10 minutes

C) 712 minutes

D) 5 minutes

Show Answer

Answer:

Correct Answer: D

Solution:

  • 78 of Cu decays in 15 minutes.
    ∴ Cu undecayed =N=1−78=18=(12)3
    ∴ No. of half lifes = 3 n=tT or 3=15T
    ⇒ T = half-life period =153=5 minutes
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