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# A Freshly Prepared Radioactive Source of Half-life 2 H Emits Radiation of Intensity Which is 64 Times the Permissible Safe Level. the Minimum Time After Which It Would Be Possible - Physics

#### Question

A freshly prepared radioactive source of half-life 2 h emits radiation of intensity which is 64 times the permissible safe level. The minimum time after which it would be possible to work safely with this source is

• 6 h

• 12 h

• 24 h

• 128 h.

#### Solution

12 h

A freshly prepared radioactive source emits radiation of intensity that is 64 times the permissible level. This means that it is possible to work safely till 6 half-lives (as 26 = 64) of the radioactive source. Since the half-life of the source is 2h, the minimum time after which it would be possible to work safely with this source is 12 h.

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#### APPEARS IN

HC Verma Solution for Concepts of Physics - Vol. 2 (2018 to Current)
Chapter 24: The Nucleus
MCQ | Q: 14 | Page no. 441

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Solution A Freshly Prepared Radioactive Source of Half-life 2 H Emits Radiation of Intensity Which is 64 Times the Permissible Safe Level. the Minimum Time After Which It Would Be Possible Concept: Radioactivity - Law of Radioactive Decay.
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