Radioactive decay. Is energy released? OPINION PLEASE

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Homework Help Overview

The discussion revolves around the concept of energy release during radioactive decay, specifically in the context of the decay of radium-226. Participants are exploring whether energy is released in this process, despite the conservation of nucleon number.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster expresses uncertainty about the energy release in radioactive decay, referencing textbook information and questioning the implications of mass conservation. Other participants discuss the relationship between mass and energy, with one noting that the products of the decay appear to have less mass, suggesting mass conversion to energy.

Discussion Status

The discussion is active, with participants sharing differing viewpoints on the energy release associated with radioactive decay. Some guidance is provided regarding the relationship between mass and energy, but no consensus has been reached.

Contextual Notes

The original poster indicates that this question is part of their final exam, which may impose constraints on the depth of discussion or the types of responses sought.

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[SOLVED] Radioactive decay. Is energy released? OPINION PLEASE!

This is my last question in my last Physics exam!
YES! I'M ALMOST DONE! :smile:

I would just like your opinion on this question...
My answer is Yes... But sometimes I think it should be NO because
of the question's option for a No answer. But from what I understand
in the textbook, the answer should be YES.

1. THE QUESTION:

The decay of \frac{226}{88}Ra results in the release of some energy. Your book tells you that energy
is released in a nuclear reaction when mass is changed to energy. Yet there are the same
number of nucleons before the decay as there are after the decay. Is energy released
in this reaction without a conversion of mass? If not, what mass is converted?
2. MY ANSWER:

Yes, energy is released in this reaction even though the total amount of nucleons in the two new atoms are still the same. Why? Well, the textbook says that when an element transmutates, energy is released in three forms: gamma radiation, the kinetic energy of the alpha or beta particle, and the kinetic energy of the new element. In addition, gamma radiation is massless energy. So if the radium particle emitted gamma rays, its mass would not be affected, even though energy was released.
FYI: This question is a continuation of the previous problem, which is: \frac{226}{88}Ra decays into Rn (atomic #86) and an alpha particle. Complete the reaction written below.

\frac{226}{88}Ra \Rightarrow (my answer follows) \frac{222}{86}Rn + \frac{4}{2}He
 
Physics news on Phys.org
If you add up the masses of the reaction products, you'll find that they are lighter. mass is converted to energy.
 
If energy isn't released then the Mayor of Hiroshima has some questions to answer about a very large insurance claim.
 
mgb_phys said:
If energy isn't released then the Mayor of Hiroshima has some questions to answer about a very large insurance claim.

lol :D
 

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