A certain radioactive element A, has a half life = t
seconds. In (t/2) seconds the fraction of the initial
quantity of the element so far decayed is nearly
(a) 29%
(b) 15%
(c) 10%
(d) 45%
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Answer / alakesh
Ans is "a" . In (t/2) seconds the fraction of the initial
quantity of the element so far decayed is nearly 29%.
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Select the correct statements (a) A simple harmonic motion is necessarily periodic (b) An oscillatory motion is necessarily periodic (c) A periodic motion is necessarily oscillatory (d) All of the above.
A radioactive element x has an atomic number of 100. It decays directly into an element y which decays directly into element z. In both processes a charged particle is emitted. Which of the following statements would be true? (a) y has an atomic number of 102 (b) y has an atomic number of 101 (c) z has an atomic number of 100 (d) z has an atomic number of 101
NLO : RPS : : ? : ZXA
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