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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.
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Topics: Radioactivity
(83)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The capacitance of two concentric spherical shells of radii R₁ and R₂ (R₂>R₁) is
- The instantaneous values of alternating current and voltages in a circuit are given as
- A body covers 200 cm in the first 2 seconds and 220 cm in the next 4 seconds.
- If the band gap between valence band and conduction band in a material is 5.0 eV,
- A disc of mass 100 g is kept floating horizontally in air by firing bullets
Topics: Radioactivity (83)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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