Question detail

What is the definition of count rate in nuclear physics?

Try the question, check the answer, then read the explanation to understand the curriculum point.

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At a glance

MCQ

Type

practice

Style

Topic

Atoms and nuclear radiation

Question

A. The number of radioactive atoms in a sample
B. The number of counts detected each second or each minute
C. The total energy emitted by a radioactive source
D. The time taken for half of the radioactive nuclei to decay

Answer

The number of counts detected each second or each minute

Explanation

Count rate refers specifically to the number of counts detected in a given time frame, typically measured in seconds or minutes.

Common mistake

Misunderstanding Count Rate

Students often confuse count rate with total counts over time, thinking it represents the total number of counts detected rather than the rate at which counts are detected.

Emphasize that count rate is defined as the number of counts detected per second or per minute, and practice converting total counts into a rate by dividing by the time period.

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