Question detail

What is the purpose of subtracting the background count rate from the measured count rate?

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At a glance

MCQ

Type

practice

Style

Topic

Atoms and nuclear radiation

Question

A. To find the total activity of the sample
B. To determine the half-life of the sample
C. To correct for unwanted radiation interference
D. To measure the mass of the radioactive material

Answer

The correct answer is C: To correct for unwanted radiation interference.

Explanation

The correct answer is C: To correct for unwanted radiation interference. This supports the learning objective "Correct measured count rate by subtracting background count rate." in Half-lives and the random nature of radioactive decay because it uses the correct atomic and nuclear radiation relationship for Atoms and nuclear radiation. The other options are less suitable because they do not match the required Half-lives and the random nature of radioactive decay idea: To find the total activity of the sample; To determine the half-life of the sample; To measure the mass of the radioactive material.

Common mistake

Subtracting Background Count Rate

Students often forget to subtract the background count rate from the measured count rate, leading to inaccurate results.

Always remember to subtract the background count rate from the measured count rate to find the true count rate from the radioactive source.

Related flashcards

Flashcard 1 of 5

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If the background count rate is 5 counts per minute and the measured count rate is 20 counts per minute, what is the corrected count rate? Use the ionisation comparison context to keep Half-lives and the random nature of radioactive decay distinct from nearby atomic and nuclear radiation ideas.