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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
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Topics: Radioactivity
(83)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The total energy of an electron in the first excited state of hydrogen atom
- Two bodies of mass 0.25 kg each moving towards each other with velocity
- The respective speeds of the molecules are 1,2,3,4 and 5 km/s.
- The half life of radium is about 1600 year. Of 100 gram of radium existing now
- If rope of lift breaks suddenly, the tension exerted by the surface of the lift
Topics: Radioactivity (83)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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