| ⇦ | 
| ⇨ |
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: - An electric kettle takes 4A current at 220 V. How much time will it take to boil 1 kg
- The control rods used in a nuclear reactor can be made up of
- In a n-p-n transistor about 10¹⁰ electrons enter the emitter in 2 μs,
- The instantaneous angular position of a point on a rotating wheel is given by
- What is the voltage gain in a common-emiiter amplifier, when input resistance is 4 Ω
Topics: Radioactivity
(83)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- An electric kettle takes 4A current at 220 V. How much time will it take to boil 1 kg
- The control rods used in a nuclear reactor can be made up of
- In a n-p-n transistor about 10¹⁰ electrons enter the emitter in 2 μs,
- The instantaneous angular position of a point on a rotating wheel is given by
- What is the voltage gain in a common-emiiter amplifier, when input resistance is 4 Ω
Topics: Radioactivity (83)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply