| ⇦ | 
| ⇨ |
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: - In the diffraction pattern of a single slit
- A parallel plate condenser with a dielectric of dielectric constant K between the plates
- Three cells, each of e.m.f 1.5 V and internal resistance 1 ohm are connected in parallel
- A radiation of energy ‘E’ falls normally on a perfectly reflecting surface
- The minimum wavelength of X-rays emitted by X-ray tube is 0.4125Å
Topics: Radioactivity
(83)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- In the diffraction pattern of a single slit
- A parallel plate condenser with a dielectric of dielectric constant K between the plates
- Three cells, each of e.m.f 1.5 V and internal resistance 1 ohm are connected in parallel
- A radiation of energy ‘E’ falls normally on a perfectly reflecting surface
- The minimum wavelength of X-rays emitted by X-ray tube is 0.4125Å
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