| ⇦ | 
| ⇨ |
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: - A rectangular coil of length 0.12 m and width 0.1 m having 50 turns of wire
- Carbon,silicon and germanium have four valence electrons each. At room temperature
- In a P-N junction
- If a wire is stretched to four times its length, then the specific resistance
- Initial pressure and volume of a gas are P and 800cc. If the final volume is 100cc
Topics: Radioactivity
(83)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A rectangular coil of length 0.12 m and width 0.1 m having 50 turns of wire
- Carbon,silicon and germanium have four valence electrons each. At room temperature
- In a P-N junction
- If a wire is stretched to four times its length, then the specific resistance
- Initial pressure and volume of a gas are P and 800cc. If the final volume is 100cc
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