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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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Subject: Physics
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A U²³⁵ reactor generates power at a rate of P producing 2×10⁸ fission per second.
- A spring of spring constant 5 x 10³ Nm⁻¹ is streched intially by 5 cm from
- A microscope is having objective of focal length 1 cm and eye-piece of focal length 6 cm.
- Which one of the following electrical meter has the smallest resistance?
- Vessel A is filled with hydrogen while vessel B, whose volume is
Topics: Radioactivity (83)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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