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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
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Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- If a vector 2i+3j+8k is perpendicular to the vector 4j-4i+αk, then value of α is
- The ‘rad’ is the correct unit used to report the measurement of
- A coil of inductive reactance 31 Ω has a resistance of 8 Ω. It is placed in series
- A black body radiates 20 W at temperature 227⁰C. It temperature of the black body
- In an LCR series A.C circuit, the voltage across each of the components, L, C and R is 50V
Topics: Radioactivity (83)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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