| ⇦ | 
| ⇨ |
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: - An electron moving in a uniform magnetic field of induction of intensity B,
- In a mass spectrometer used for measuring the masses of ions, the ions
- A coil of 40 henry inductance is connected in series with a resistance of 8 ohm
- Which of the following physical quantities has neither dimensions nor unit
- The material suitable for making electromagnets should have
Topics: Radioactivity
(83)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- An electron moving in a uniform magnetic field of induction of intensity B,
- In a mass spectrometer used for measuring the masses of ions, the ions
- A coil of 40 henry inductance is connected in series with a resistance of 8 ohm
- Which of the following physical quantities has neither dimensions nor unit
- The material suitable for making electromagnets should have
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