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A sample of radioactive element has a mass of 10 gram at an instant t=0. The approximate mass of this element in the sample after two mean lives is
Options
(a) 2.50 gram
(b) 3.70 gram
(c) 6.30 gram
(d) 1.35 gram
Correct Answer:
1.35 gram
Explanation:
M = M₀ e-λt
Since, t = 2/λ, we get
M = 10 × e-λ × (2/λ) = 10 e⁻² = 1.35 gram
Related Questions: - Two resistors of 6Ω and 9Ω are connected in series to a 120 V source.
- A solid cylinder of mass M and radius R rolls without slipping down and inclined plane
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Topics: Radioactivity
(83)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Two resistors of 6Ω and 9Ω are connected in series to a 120 V source.
- A solid cylinder of mass M and radius R rolls without slipping down and inclined plane
- A stone tied to the end of a string of 1 m long is whirled in a horizontal circle
- A body of mass 3 kg is under a constant force which cause a displacement
- A wheel has angular acceleration of 3.0 rad/sec² and an initial angular speed
Topics: Radioactivity (83)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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