⇦ | ⇨ |
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 potential energy of a weightless spring compressed by a distance D is proportional
- A parallel plate air capacitor is charged to a potential difference of V volts.
- The drift speed of electrons in copper wire of diameter and length l is v.
- A bar magnet of pole strength 10 A-m is cut into two equal parts breadthwise.
- The manifestation of band structure in solids is due to
Topics: Radioactivity
(83)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The potential energy of a weightless spring compressed by a distance D is proportional
- A parallel plate air capacitor is charged to a potential difference of V volts.
- The drift speed of electrons in copper wire of diameter and length l is v.
- A bar magnet of pole strength 10 A-m is cut into two equal parts breadthwise.
- The manifestation of band structure in solids is due to
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