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The MeV means million electron volts. It's a measure of the energy the energy in the photon, which is a quantum (or specific quantity) of electromagnetic energy. This 1 megaelectron volt = 1.60217646 × 10-13 joules of energy.

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17y ago

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How many hydrogens do you have to fuse together to make one helium?

None. Hydrogen and Helium are base elements.Helium is helium.Chemically yes, but with Nuclear Physics in stars:H + H --> D + e+ + v + 0.42 MeV, H + H --> D + e+ + v + 0.42 MeV, D + D --> He3 + n + 3.27 MeV (50%)H + H --> D + e+ + v + 0.42 MeV, H + H --> D + e+ + v + 0.42 MeV, D + D --> He3 + H + 4.03 MeV (50%)H + H --> D + e+ + v + 0.42 MeV, H + D --> He3 + gamma photon + 5.49 MeV, H + H --> D + e+ + v + 0.42 MeV, H + D --> He3 + gamma photon + 5.49 MeV, He3 + He3 --> He + H + H + 12.86 MeV (100%)H + D --> He3 + gamma photon + 5.49 MeV (100%)D + D --> He3 + n + 3.27 MeV (50%)D + D --> He3 + H + 4.03 MeV (50%)D + T --> He + n + 17.59 MeV (100%)T + T --> He + n + n + 11.33 MeV (100%)Four or two, depending on the kind of hydrogen isotope you are burning. As you can see in the equations above burning four ordinary atoms of hydrogen to ordinary helium is a complicated and slow process compared to burning two atoms of various isotopes of hydrogen, however a star has such tiny quantities of deuterium and tritium that depending on them for fusion helps little.


Who is bigger photon electron neutron proton?

The neutron is the largest of the particles mentioned. Compared to the proton, it has an additional weight of 1.293 MeV.


Why you need 1.022 Mev in pair?

Pair production can only occur if the energy of the photon is bigger than the rest mass (E0 = m0*c^2) of electron and positron, because this is the energy needed to create these particle (conservation of energy). Excess energy will be kinetic energy of the electron and positron. Rest mass of electron and positron is 0.511 MeV each, so 1.022 MeV in total.


Find the energy of a photon whose frequency is 5x10 12 Hz?

The energy of a photon can be calculated using the formula E = h * f, where h is Planck's constant (6.626 x 10^-34 J*s) and f is the frequency of the photon. Thus, for a frequency of 5 x 10^12 Hz, the energy of the photon would be 3.31 x 10^-21 Joules.


What fuses together to form helium?

There are a bunch of ways helium can be formed, but the two that might be most important are the fusion of two deuterium atoms to form helium and the fusion of one deuterium atom with one tritium atom to form helium.H + D --> He3 + gamma photon + 5.49 MeV (100%)H + Li7 --> He + He + 17.35 MeV (100%)D + D --> He3 + n + 3.27 MeV (50%)D + D --> He3 + H + 4.03 MeV (50%)D + T --> He + n + 17.59 MeV (100%)D + He3 --> He + H + 18.35 MeV (100%)D + Li6 --> He + He + 33.37 MeV (100%)T + T --> He + n + n + 11.33 MeV (100%)He3 + He3 --> He + H + H + 12.86 MeV (100%)


How many MeV's are in one electron volt?

one MeV has 1,000,000 eVs So one eV has 0.000001 MeVs


How do you convert joules into MeV?

To convert joules to megaelectronvolts (MeV), you can use the conversion factor 1 MeV = 1.60218 x 10^-13 joules. Simply divide the energy in joules by this conversion factor to get the equivalent energy in MeV.


If an electron and photon both have energy of 5 mega electron volt which will cause pair production?

pair production only occurs with photons. The necessary condition is that the energy of the photon is greater than that of the two particles that are going to be produced. With 5 mega electron volts as an energy your photon would still not have enough juice as the two smallest particles that can be build are electron and its anti patricle the positron. Both have 511 MeV. You are looking at a trickquestion as neither can.


How many joules are there in 474 MeV?

To convert from mega electronvolts (MeV) to joules, you can use the conversion factor 1 MeV = 1.602 x 10^-13 joules. So, to convert 474 MeV to joules: 474 MeV * 1.602 x 10^-13 joules = 7.595 x 10^-11 joules.


What is the conversion factor from kelvin to mega-electronvolts (MeV)?

The conversion factor from kelvin to mega-electronvolts (MeV) is approximately 8.617 x 10-5 MeV per kelvin.


How many volts are in 5 MeV?

1 MeV is equal to 1.6 x 10^-13 volts. Therefore, 5 MeV is equal to 8 x 10^-13 volts.


Which two particles in an atom about the same mass?

Proton and NeutronOK, in very very round figures, but the neutron actually is more massive.In the first approximation, the neutron's mass about as much as a proton plus one electron or (P)938.235 MeV + (e)0.51098 MeV = 938.74598 MeV.In the second approximation, the energy of the neutrino, photon, and electron velocities ejected in free neutron beta decay would be added, but I can't find that in my references right now so I'll skip the math.There are probably also third approximation terms to account for, if not more.As measured, the neutron's mass is 939.529 MeV.