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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
- An electron in hydrogen atom makes a transition n₁ → n₂
- A black body at 227⁰C radiates heat at the rate of 7cals/cm²s. At a temperature
- An oscillator circuit consists of an inductance of 0. mH and a capacitor of 20 μF.
- A body moves with a uniform acceleration a and zero initial velocity
- 4 point charges each +q is placed on the circumference of a circle
Topics: Radioactivity (83)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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