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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
- Oil spreads over the surface of water where as water does not spread
- A radioactive substance emits n beta particles in the first 2 s and 0.5 n beta
- The excess pressure inside one soap bubble is three times that inside a second soap bubble
- A piece of iron is heated in a flame. It first comes dull red then becomes reddish
- Water falls from a height of 60m at the rate of 15 kg/s to operate a turbine
Topics: Radioactivity (83)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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