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A radioactive substance has a half-life of four months. Three-fourth of substance will decay in
Options
(a) 3 months
(b) 4 months
(c) 8 months
(d) 12 months
Correct Answer:
8 months
Explanation:
Substance left undecayed N = N₀ – (3 / 4) N₀ = (1 /4) N₀
N / N₀ = (1 / 2)ⁿ
where n = number of half lives
.·. 1 / 4 = (1 / 2)ⁿ (or), n = 2 n = t / T₁/₂ t = nT₁/₂ = 2 × 4 = 8 months.
Related Questions: - During an adiabatic process, the cube of the pressure is found to be inversely
- A long straight wire of radius a carries a steady current I. The current is uniformly
- Two strings A and B, made of same material are stretched by same tension
- If the value of potential in an A.C circuit is 10 V, the peak value of potential is
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Topics: Radioactivity
(83)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- During an adiabatic process, the cube of the pressure is found to be inversely
- A long straight wire of radius a carries a steady current I. The current is uniformly
- Two strings A and B, made of same material are stretched by same tension
- If the value of potential in an A.C circuit is 10 V, the peak value of potential is
- Two identical circular coils A and B are kept on a horizontal tube
Topics: Radioactivity (83)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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