Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12
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Ten Grams of 57co Kept in an Open Container Beta-decays with a Half-life of 270 Days. the Weight of the Material Inside the Container After 540 Days Will Be Very Nearly (A) 10 G (B) 5 G - Physics


Ten grams of 57Co kept in an open container beta-decays with a half-life of 270 days. The weight of the material inside the container after 540 days will be very nearly


  • 10 g

  • 5 g

  • 2.5 g

  • 1.25 g

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10 g

57Co is undergoing beta decay, i.e. electron is being produced. But an electron has very less mass (9.11×10-31 kg) as compared to the Co atom. Therefore, after 570 days, even though the atoms undergo large beta decay, the weight of the material in the container will be nearly 10 g.

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HC Verma Class 11, Class 12 Concepts of Physics Vol. 2
Chapter 24 The Nucleus
MCQ | Q 17 | Page 441
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