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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
Related Questions: - The width of the diffraction band varies
- The period of oscillation of a mass M suspended from a spring of negligible mass is T
- The particle executing simple harmonic motion has a kinetic energy K₀cos²ωt.
- Two bodies of masses m₁ and m₂ are initially at rest at infinite distance apart
- A neutron is moving with a velocity u.It collides head on and elastically with an atom
Topics: Radioactivity
(83)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The width of the diffraction band varies
- The period of oscillation of a mass M suspended from a spring of negligible mass is T
- The particle executing simple harmonic motion has a kinetic energy K₀cos²ωt.
- Two bodies of masses m₁ and m₂ are initially at rest at infinite distance apart
- A neutron is moving with a velocity u.It collides head on and elastically with an atom
Topics: Radioactivity (83)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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