| ⇦ | 
| ⇨ |
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: - If by mistake voltmeter is connected in series and ammeter in parallel then
- For a satellite moving in an orbit around the earth, the ratio of kinetic
- A photon of wavelength 300nm interacts with a stationary hydrogen atom in ground
- The self induced e.m.f. in a 0.1 H coil when the current in it is changing
- An ideal spring with spring constant K is hung from the ceiling and a block of mass
Topics: Radioactivity
(83)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- If by mistake voltmeter is connected in series and ammeter in parallel then
- For a satellite moving in an orbit around the earth, the ratio of kinetic
- A photon of wavelength 300nm interacts with a stationary hydrogen atom in ground
- The self induced e.m.f. in a 0.1 H coil when the current in it is changing
- An ideal spring with spring constant K is hung from the ceiling and a block of mass
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