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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 cells, having the same e.m.f. are connected in series through an external resistance
- The difference in the variation of resistance with temperature in a metal
- Pure Si at 300 k has equal electrons (nₑ) and hole (nh) concentrations
- A particle of mass 100 g is thrown vertically upwards with a speed of 5 m/s. The work
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Topics: Radioactivity
(83)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Two cells, having the same e.m.f. are connected in series through an external resistance
- The difference in the variation of resistance with temperature in a metal
- Pure Si at 300 k has equal electrons (nₑ) and hole (nh) concentrations
- A particle of mass 100 g is thrown vertically upwards with a speed of 5 m/s. The work
- Time period of the rotation of the earth about its own axis is 24 hour
Topics: Radioactivity (83)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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