| ⇦ | 
| ⇨ |
The half life of radium is about 1600 year. Of 100 gram of radium existing now, 25g will remain unchanged after
Options
(a) 4800 year
(b) 6400 year
(c) 2400 year
(d) 3200 year
Correct Answer:
3200 year
Explanation:
100 gram at beginning, I = 0
25 gram remains undecayed.
N / N₀ = (1 / 2)ⁿ ⇒ 25 / 100 = (1 / 2)ⁿ
⇒ 1 / 4 = (1 / 2)ⁿ
Therefore, n = 2
Time = n × T
= 2 × 1600
= 3200 years.
Related Questions: - The radius of curvature of the convex face of a plano-convex lens is 12 cm
- A particle moving along X-axis has acceleration f,at time t given by f=fₒ(1- t/T)
- The internal energy change in a system that has absorbed 2 kcals of heat
- The minimum wavelength of X-rays produced in a Collidge tube operated
- Electrical force is acting between two charges kept in vacuum. A copper plate
Topics: Radioactivity
(83)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The radius of curvature of the convex face of a plano-convex lens is 12 cm
- A particle moving along X-axis has acceleration f,at time t given by f=fₒ(1- t/T)
- The internal energy change in a system that has absorbed 2 kcals of heat
- The minimum wavelength of X-rays produced in a Collidge tube operated
- Electrical force is acting between two charges kept in vacuum. A copper plate
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