| ⇦ | 
| ⇨ |
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 resistance of a carbon resistor of colour code Red-Red Green Silver is(in kΩ)
- The dual nature of light is exhibited by
- In Young’s double slit experiment, the phase difference between the two waves
- A simple pendulum performs simple harmonic motion about x = 0 with an amplitude
- Three solids of masses m₁,m₂ and m₃ are connected with weightless string
Topics: Radioactivity
(83)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The resistance of a carbon resistor of colour code Red-Red Green Silver is(in kΩ)
- The dual nature of light is exhibited by
- In Young’s double slit experiment, the phase difference between the two waves
- A simple pendulum performs simple harmonic motion about x = 0 with an amplitude
- Three solids of masses m₁,m₂ and m₃ are connected with weightless string
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