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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 displacement ‘x’ (in meter) of a particle of mass ‘m’ (in kg) moving in one
- Young’s modulus of the material of a wire is 18×10¹¹ dyne cm⁻².its value in SI is
- Two bulbs 60 W and 100 W designed for voltage 220 V are connected in series
- A boat which has a speed of 5 kmh⁻¹ in still water crosses river of width 1 km long
- If the band gap between valence band and conduction band in a material is 5.0 eV,
Topics: Radioactivity (83)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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