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2019 BGCSE Physics Paper-1 Question-42
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Q-50
The half-life of radioactive cobalt-56 is approximately 77 days. A sample contains 10 grams of cobalt-56. What will be the mass of cobalt-56 in the sample, after 154 days?
2.5 grams
5.0 grams
14 grams
46 grams
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