SUNIL BATRA (41 YEARS IITJEE PHYSICS)|Exercise Comprehension Based Questions|2 Videos
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SUNIL BATRA (41 YEARS IITJEE PHYSICS)|Exercise MCQs(d )|1 Videos
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A 280 day old radioactive substances shows an activity of 6000 dps, 140 days later its activity becomes 3000 dps. What was its initial activity ?
After 280 days, the activity of a radioactive sample is 6000 dps. The activity reduces to 3000 dps after another 140 days. The initial activity of the sample in dps is
After 225 days the activity of a sample is 4000 decay/s. The activity reduces to 2000 decay/s after another 75 days. The initial activity of the sample is
Half-life period of a radioactive substance is 6 h . After 24 h activity is 0.01 muC , what was the initial activity ?
A radioactive sample has initial activity of 28 dpm 30 minutes later its activity 14 dpm . How many atoms of nuclide were present initially?
A sample of radioactive substance loses half of its activity in 4 days. The time in which its activity is reduced to 5% is
Radioactive 138I has a half-life of 8.0 days .A sample containing 138I has activity 20 mu Ci at t=0.(a) What is its activity at t=4.0 days?(b) What is its decay constant at t=4.0 days?
After 300 days, the activity of a radioactive sample is 5000 dps (disintegrations per sec). The activity becomes 2500 dps after another 150 days. The initial activity of the sample in dps is
The half life of a radioactive substance is 5xx10^(3) yrs. In how many years will its activity decay to 0.2 times its initial activity? Take log_(10) 5=0.6990 .
The activity of a radioactive substance is readuced by 80% in 100 days. Its half life is
SUNIL BATRA (41 YEARS IITJEE PHYSICS)-MODERN PHYSICS-MCQ (One Correct Answer
