# Correct statement regarding the graph of binding energy per nucleon

## Homework Statement:

The graph below shows how the binding energy per nucleon of a nucleus varies with mass number A
(graph is given below)

Let region P is around mass number equals to 5, region Q is around mass number equals to 50 and region R is around mass number equals to 200

Which one of the following statements is not true?
a. The binding energy per nucleon increases most significantly at lower nucleon numbers
b. Nuclei in region Q are more stable than nuclei in region R
c. Nuclear fusion reaction bring nuclei closer to region Q
d. Energy is released in nuclear fission reactions from nuclei in region R

## Homework Equations:

Not sure
Option A is correct because the graph increases sharply at lower nucleon number

Option B is correct because higher binding energy per nucleon means more stable

Option C is correct because either fusion or fission will bring the product to Q

So my guess the answer is D but I do not understand why

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haruspex
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Gold Member
Option C is correct because either fusion or fission will bring the product to Q
Regardless of the mass numbers of the original atomic species?

• songoku
Regardless of the mass numbers of the original atomic species?
Yes I think so

haruspex
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Gold Member
Yes I think so
Then how are elements past Iron created?

• songoku
Then how are elements past Iron created?
Ah I see. In star the formation of heavier element than iron is through fusion. So the answer should be C.

Thank you very much

Sorry haruspex, my friend said the answer to this question is D (based on the answer key)

haruspex
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Gold Member
Sorry haruspex, my friend said the answer to this question is D (based on the answer key)
I didn't study D. Yes, that is wrong, but I had not interpreted the question as implying only one was wrong. I believe the correct answer is C and D.

• songoku
I am sorry for late reply

Why is option D wrong? I think nuclei in region R will be more likely to undergo fission and fission reaction also releases energy

Thanks

haruspex
Homework Helper
Gold Member
I am sorry for late reply

Why is option D wrong? I think nuclei in region R will be more likely to undergo fission and fission reaction also releases energy

Thanks
Sorry, I have no idea why I wrote that. Must have misread something.

• songoku
Sorry, I have no idea why I wrote that. Must have misread something.

haruspex
Homework Helper
Gold Member
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