How Does Half-Life Affect Remaining Mass of a Radioactive Isotope?

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Homework Help Overview

The discussion revolves around understanding the concept of half-life in the context of a radioactive isotope. The original poster is trying to determine the remaining mass of an isotope after a specified period, given its half-life.

Discussion Character

  • Exploratory, Conceptual clarification

Approaches and Questions Raised

  • Participants explore the definition of half-life and its implications for calculating remaining mass over time. Questions about the number of half-lives that have passed and the corresponding mass reductions are raised.

Discussion Status

The discussion is progressing with participants clarifying definitions and exploring calculations related to half-life. Some guidance has been provided regarding the relationship between time and half-lives, and the original poster appears to be confirming their understanding of the mass remaining after each half-life.

Contextual Notes

There is an emphasis on the need for the original poster to show their work in accordance with forum rules, which may influence the depth of the discussion.

dansics
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hello..im new to nuclear physics and i have problems attempting helf life questions.. hope you can help me with this question..

The half-life of a given radioactive isotope is 10 years. What is the mass of this isotope remaining undecayed after 20 years if the original mass was 12g? thank you..
 
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Welcome to PF, dansics. Please note that for homework questions, you need to show some work before we can help you, as per forum rules.

What is the definition of half life?
 
the defination of half-life is the time-taken for half the original unstable radioactive nuclei to decay.
 
Ok, so the question asks what mass is remaining after 20 years. How many half lives is this? What mass of the original isotope remains after one half life? From this can you say what mass remains after the number of half lives equivalent to 20 years?
 
emm..so in 10 years, the mass is reduced to 6 g and in 20 years the mass is then reduced to 3g?
Am i right?
 
Yup, you are correct.
 

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