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Recent questions tagged telegram-3400

(chatquestion)...The half life of a radioactive substance is 28. 23.10 minute. If 1023 atoms of the substance are active at any instant of time, then the activity of the substance will be - (in dps) (A) 1 × 1019 (C) 5 x 1019 (B) 3 x 1019 (D) 7 × 1019 The weight based ratio of U238 and Pb226 in a sample of rock is 4: 3. If the half life of U238 is 4.5 × 109 years, then 29. the of rock is - age (A) 9.0 × 109 years (B) 6.3 x 109 years (C) 4.5 x 109 years (D) 3.78 × 109 years

asked Jan 28, 2020 by balaji.thirumalai

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