A Sample of a Radioisotope Shows an Activity of 999

question 53

Multiple Choice

A sample of a radioisotope shows an activity of 999 disintegrations per minute due to beta decay. If after 1.10 years the activity is 952 disintegrations per minute, what is the half-life of this radioisotope

• A) 4.38 * 10^-2 yr
• B) 11.4 yr
• C) 0.25 yr
• D) 15.8 yr
• E) 9.1 yr

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Definitions:

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A group of steroid hormones that play a crucial role in the development and regulation of the female reproductive system and secondary sexual characteristics.

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A region at the front of the hypothalamus involved in regulating temperature, reproductive behaviors, and sleep.

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Specialized cells within the nervous system that transmit information to other neurons, muscle cells, or gland cells.