(A) directly proportional to the area of cross-section
(B) inversely proportional to the area of cross-section
(C) proportional to square of the area of cross-section
(D) independent of the area of cross-section
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What is the absorbed dose ‘D’ of a sample of 2Kg which is given an amount of 100J of radioactive energy:
(A) 200Gy
(B) 50 Gy
(C) 102 Gy
(D) 98 Gy
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Sodium-24 has half-life of 15 hours and it is used in medicine estimate:
(A) Kidney function
(B) Plasma blood volume
(C) Iron in plasma
(D) Thyroid function
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The decay of a radioactive nuclide is represented by the equation dN =-λN dt where (λ = 2.4×10 s . The half-life of the nuclide will be):
(A) 2.9 x 10 power7 s
(B) 3.4 x 10 power-8s
(C) 1.3 x 10 power 7s
(D) 8 x 10 power-8s
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What percentage of the parent isotope remains after 0.5 half-lives have passed?
(A) 70.7%
(B) 100%
(C) 50%
(D) 0.5%
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The half-life of a radioactive element is such that 7 8 of a quantity of it decays in 12 days what fraction of it remain undecayed after 24 day?
(A) 0
(B) 1/128
(C) 1/64
(D) 1/32
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It is a general principle for all radioactive element that whatever may be their half-life, their full life will be:
(A) Finite
(B) Infinite
(C) Constant
(D) None of these
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With reference to the interaction of electrons (cathode) with atoms of the anode, what percentage of typically heat occurs:
(A) 1%
(B) 10%
(C) 0.1%
(D) 99%
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λ × T1/2:
(A) 0.963
(B) loge1/2
(C) loge2
(D) A and C