A Radioactive Source Has a Half-Life of 2 Min

question 4

Multiple Choice

A radioactive source has a half-life of 2 min. At time t = 0 it is placed near a detector and the counting rate is observed to be 3000 counts/s. If the detection efficiency is 25%, how many radioactive nuclei are there at time t = 0?

• A) 1.04 × 10⁶.
• B) 1.67 × 10⁶
• C) 2.08 × 10⁶
• D) 3.41 × 10⁶
• E) 3.79 × 10⁶

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Definitions:

Income Distribution

The way in which total income is shared among individuals or households within an economy.

Noncash Transfers

Types of government assistance such as food stamps and housing vouchers that provide benefits other than direct cash payments.

Income Inequality

Income inequality refers to the unequal distribution of income among a population, often measured using various statistical methods to illustrate disparities in wealth.

Housing Subsidies

Financial assistance provided by a government or organization to help individuals or families afford housing, typically to reduce housing expenses to a manageable level.