Questions tagged [binding-energy]

Please use binding energy in the context of the atomic scale and/or atomic systems. This can be used in nuclear reactions.

Filter by
Sorted by
Tagged with
1
vote
1answer
27 views

Mass-energy equation vs chemical bonding reactions

If use $E=mc^2$ in chemical energy like needs to bonding and ...  it means there must reduced or added some mass after reaction, by Wikipedia mass-energy equivalence: Because the speed of light is ...
1
vote
1answer
49 views

Nuclear binding energy and mass defect

Kenneth S. Krane, Introductory to Nuclear Physics, defines mass defect as Δ=(m(A,Z)-A)$c^2$, where m is the mass of the nucleus with atomic number Z and mass number A and he says that given Δ, we can ...
1
vote
1answer
50 views

Need help understanding a radioactive decay question

I have the following question: A stationary nucleus of uranium-$238$ undergoes alpha decay to form thorium-$234.$ The following data are available. Energy released in decay $4.27 MeV$, Binding ...
1
vote
2answers
33 views

Why is there a link between binding energy per nucleon and fission energy?

"The reason energy is released in fission is because the daughter nuclei have a greater binding energy per nucleon." I just can't get my head around this for some reason. I am in high school physics. ...
0
votes
0answers
11 views

Binding and exfoliation energy

This question could seem simple, but it's not clear for me. Let's say I have a $\text{MoS}_2$ bilayer, is its binding energy same with exfoliation energy? As far as I know, we can calculate binding ...
13
votes
5answers
1k views

Fundamentally, why do some nuclei emit ionizing radiation?

I understand that some nuclei and their isotopes are not stable and therefore at random intervals bits of the nucleus (i.e. protons & neutrons) break away with differing amounts of energy ...
6
votes
7answers
6k views

As neutrons are more massive than protons, does the Sun increase its mass while fusioning elements?

Where is the mass coming from when neutrons are produced from protons in the Sun? If a positron is made, will it possibly annihilate with an nearby electron?
2
votes
1answer
36 views

Quantitative contribution of kinetic and potential energies to the binding energy of the $\sigma$ orbital in $\text{H}_2$ or $\text{H}_2^+$

When a hydrogen molecule forms, 4.52 eV of energy is released, while for $\text{H}_2^+$ the binding energy is 2.77 eV. Such a binding energy is the difference of energies that have four terms in them: ...
0
votes
1answer
37 views

Why is energy released during the formation of the nucleus?

We know that mass defect in the nucleus occurs because of mass being converted to energy by the mass-energy equivalence. If that's the case then what triggered the release of energy during the ...
0
votes
1answer
29 views

What is the force at play in the emission of neutron out of Helium-5

On nuclear fusion, Wikipedia reads (about Tritium-Deuterium fusion): The (intermediate) result of the fusion is an unstable 5He nucleus, which immediately ejects a neutron with 14.1 MeV. The recoil ...
0
votes
1answer
33 views

How is the concept of binding energy linked to ionization energy?

I understand that the reason when you plot ionization energy against atomic number, you get peaks at the noble gases, is because they have full valence shells. When I was trying to think this through,...
2
votes
1answer
65 views

How does binding energy work?

I do not have a very advanced understanding of binding energy and atomic mass but in my classes, I have learned that the atomic mass is equal to the sum of the number of protons and the number of ...
0
votes
2answers
90 views

Do excited nuclear (and atomic) states have higher mass?

One of the basic calculations in nuclear theory is obtaining nuclear mass based on the liquid drop model. One uses Weizsäcker's formula to get the binding energy $$E_B=a_VA-a_SA^{2/3}-a_C\frac{Z(Z-1)}...
2
votes
2answers
61 views

Understanding nuclear mass defect

I'm having a bit of trouble understanding mass defect, in the context of nuclear physics. The argument from my class is: The nuclear force is attractive, and so does work on the particles as they are ...
0
votes
1answer
33 views

Why does the phenomenon mass deficit even occur?

I know that the missing mass is converted to energy through the use of this relation: $E=mc^2$ But, my question is why?
0
votes
0answers
49 views

What's the most likely mass for ethanol?

I am interested in learning a little about mass defect and calculating the molar mass of ethyl alcohol. I found this table of atomic weights and would like to use it to compute the mass of the ...
1
vote
2answers
40 views

When do we call a composite particle system bound?

I know that to see if a system (for example, a nucleus) is a boson, we see the total spin on it. For example, an even number of protons and neutrons would make the system a composite boson. The same ...
0
votes
2answers
81 views

What is the reason that conservation of momentum is conserved in nuclear reactions?

I understand that in nuclear reactions such as fusion or fission, it is known that energy released due to the mass defect to obey the conservation of energy. However, researching online; I fount ...
2
votes
1answer
51 views

$H_2O$ vs $2H^+ +O^{2-}$

I am wondering the mass deficit between 2*H + O and H2O. I.e. if I would know the accurate mass of one atom of hydrogen on it's own and the mass of one atom of oxygen on it's own how much of a ...
0
votes
1answer
43 views

Why does formation of iron in stars doesnt produce any energy?

Why does the formation of iron in the stars doesnt produce any energy, i have a hunch that it might have something to do with the fact that iron has the highest binding energy per nucleon and hence (...
1
vote
1answer
45 views

Finding stable superheavy elements

Finding new stable superheavy elements is big interests in nuclear physics. Nuclides with $Z>92$ are not found in nature, but can be made artificially. Usually these nuclides become more unstable ...
1
vote
0answers
24 views

Determining the binding energy in the L-shell in copper

Im having trouble grasping the following problem: Calculate the binding energy in the L-shell for copper, if the binding energy for the K-shell is $ \ 1,439*10^{-15} J\ $. I know that you find the ...
0
votes
1answer
29 views

Released energy in a reaction

I'm having some trouble in understanding how the released energy in a nuclear reaction is actually calculated. I think I understand the general approach if we are dealing with a reaction like $$\rm ^{...
0
votes
1answer
34 views

Calculating binding energy from mass defect

I am trying to wrap my head around the relationship between binding energy and mass defect. I have read that the difference between the binding energies of the products and reactants of a nuclear ...
0
votes
1answer
74 views

How to express the $Q$-value for alpha decay in terms of binding energy of the relevant species?

I have 2 questions regarding the solution to the following question: The solution states that: Mathematically, I understand how the end result $$Q=BE\left({}^{A-4}_{Z-2}\mathrm{Y}\right)+...
8
votes
4answers
2k views

Does a proton have a binding energy?

When calculating the $Q$-value, $Q = \Delta M \cdot c^2$, of this reaction: $$ ^6Li \ (\alpha, p)\ ^9Be \quad \iff \quad \alpha + \ ^6Li \ \longrightarrow \ ^9Be + p $$ The $Q$-value can also be ...
0
votes
1answer
28 views

Why doesn't a deuterium-deuterium reaction usually yield Helium-4?

I assume the above reaction is less energetically favorable than the creation of He-3 (plus a neutron) or tritium plus a proton? But why/how? Or are the hard, hot, fast collisions too much for it to ...
0
votes
1answer
103 views

Why does fusion above nickel 56 require energy?

I've always struggled with the concept of fission and fusion. I mean I can show a mass deficit with math easily enough but I have always struggled understanding the fundamental concept of why things ...
1
vote
0answers
36 views

Released energy during fusion reaction

Click to view the video at required time According to the video in the link above the binding energy for deuterium is about 2 MeV and the binding energy for tritium is about 8 MeV so the total for ...
2
votes
3answers
128 views

Binding energy, fission and fusion

My high school physics book doesn't elaborate the idea of binding energy and how it's related to fission and fusion adequately in a way that made me have wrong thoughts about these ideas. What i ...
1
vote
1answer
63 views

Binding energy and strong force

If binding energy is responsible for holding nucleons together than what is meaning of strong force?
1
vote
1answer
59 views

Reaction energy $Q$

Really simple question, but I'm confused with it because of contradictions between sources (absence of clarity online vs lecture notes (says nuclear) and practise questions provided (uses atomic) ) ...
2
votes
1answer
290 views

Why is the isotope of lead-206 stable against alpha decay?

The mass of Lead-206 is larger than that of Mercury-202 + Helium-4. Why is then Lead-206 stable against alpha decay? I have heard that the beta-decay can stabilize a nucleus against alpha decay, and ...
2
votes
1answer
36 views

Binding energy of a molecular ion?

The protons in the $\text{H}_2^{+}$ molecular ion are $0.106 \, \mathrm{nm}$ apart, and the binding energy of $\text{H}_2^{+}$ is $2.65\,\mathrm{eV} .$ What negative charge must be placed halfway ...
0
votes
2answers
47 views

Binding energy - why is my logic wrong?

We have some protons and neutrons and want to create a nucleus. We must do work against the Coloumb force to bring these protons and neutrons together to form the nucleus, this increases the energy ...
22
votes
5answers
3k views

Why do unstable nuclei form?

Why do unstable nuclei form? Is it that we simply find unstable nuclei in nature and understand what these nuclei do in order to become more stable? I feel like textbooks gloss over this question ...
0
votes
1answer
100 views

Scope of $E=mc^2$ [closed]

As far as I can see, Einstein's $E=mc^2$ is most often mentioned in the context of nuclear physics, even though it is more generally applicable. I understand that this is due to the large nuclear ...
2
votes
1answer
57 views

Stability of isotopes

Yesterday I was looking at the semi-empirical mass formula and calculating some binding energies of specific nuclei. Eventually I came across this website that listed both total binding energies per-...
0
votes
1answer
76 views

$E = mc^2$ and Binding Energy Confusion [closed]

I have been introduced to $E =mc^2$ and binding energy recently while studying nuclear physics and I have a hard time understanding the following: Mass-Energy what does $E=mc^2$ really mean, as I ...
0
votes
2answers
114 views

Limit to number of neutrons in nucleus [duplicate]

As far as I understand the number of protons in a nucleus is limited because Coulomb forces grow faster with the number of protons than the nuclear force. So alpha/cluster decay limits the size in ...
2
votes
0answers
41 views

Isn't it entropy (disorderliness) that every atom in the universe is not of iron Fe?

The concept of mass defect and binding energy Iron has most mass defect and the greatest binding energy. It has the most stable nuclei. Nuclei with higher atomic number than iron undergo fission ...
2
votes
1answer
63 views

For which kind of nuclear reactions is the nuclear binding energy per nucleon appropriate?

The nuclear binding energy curve is often presented as a reason why iron is abundant in planet cores. However, to me it is not entirely evident why binding energy per nucleon, E/A, is chosen to assess ...
1
vote
0answers
39 views

Bare Critical Masses of $^{241}$Am, $^{242m}$Am, $^{238}$Pu and $^{242}$Pu

$^{238}$Pu has 144 neutrons, and it has 2.8$\times$10$^{3}$ g$^{-1}$.s$^{-1}$ spontaneous fission neutrons and bare critical mass in 10 kg. $^{242}$Pu has 148 neutrons, and it has 1.7$\times$10$^{3}$ ...
2
votes
4answers
246 views

How much of the proton's mass is due to the Higgs field?

The proton mass is 938 MeV. People often claim that (A) The proton is a bound state of two up quarks and one down quark, with the three quarks contributing a total rest mass of $2 \times (2.2 \text{...
0
votes
1answer
88 views

Why is the actual KE value smaller than what I calculated?

Problem The nuclear equation for the decay of calcium-47 into scandium-47 is given by: The following data are available: Mass of calcium-47 nucleus = 46.95455 u Mass of scandium-47 nucleus = 46....
0
votes
1answer
65 views

Fusion Kinetic Energy

In fusion, the mass of the reactants is greater than the mass of the products. Thus, mass is lost in fusion. My thinking was that this mass defect is converted into binding energy that is then used to ...
0
votes
0answers
36 views

Why does stability come from binding energy and not mass

The mass of a nucleus is given by: $$ Mc^2=n M_n c^2+zM_pc^2-B(z,n) $$ And we were told that nuclei want to maximise the binding energy per nucleon. However, I don't see why they don't want to ...
0
votes
2answers
29 views

Why is the energy taken to free neutrons irrelevant to the energy released in a fission reaction?

Our teacher is currently teaching nuclear physics and I am confused on the process of calculating the energy released in a fission reaction. An example given in class is as follows: Uranium-235 + 1n -...
0
votes
1answer
81 views

If binding energy (from mass defect) is essentially the strong nuclear force maintaining the nucleus, why is it released?

I am aware that during nuclear fusion for light elements and nuclear fission for heavy elements, the resultant elements have less mass than the original reacting elements (ie the mass defect) because ...
0
votes
2answers
197 views

Why is energy released during fission reactions?

If the energy released during a fission reaction is the binding energy then what energy is left to bind the nucleons together? I'm very confused if there's a better explanation on fission I'd ...

1
2 3 4 5 6