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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 weight of a body on surface of earth is 12.6 N. When it is raised to a height
- A wave in a string has an amplitude of 2cm. The wave travels in the positive direction
- In cyclotron, for a given magnet, radius of the semicircle traced by positive ion
- If critical angle for a material to air passage is 30°, the refractive index
- A cell of emf E and internal resistance r supplies current for the same time
Topics: Radioactivity (83)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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