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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 moment of inertia of a rod about an axis through its centre and perpendicular
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Topics: Radioactivity
(83)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The moment of inertia of a rod about an axis through its centre and perpendicular
- After 300 days, the activity of a radioactive sample is 5000 dps
- If particles are moving with same velocity, then maximum de Broglie wavelength will
- The electric potential V at any point (x,y,z) all in meters in space is given by
- A cricket ball of mass 250 g collides with a bat with velocity 10 m/s
Topics: Radioactivity (83)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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