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gamma ray photon
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Helium is generated in the core of our sun by nuclear synthesis .During the nuclear fusion inside the sun , hydrogen is fused into helium .the main products generated in this reaction are - Gamma ray photon, positron, neutrino, isotopes of hydrogen and helium and large amount of energy .
Nuclear fusion ... the same reaction responsible for the enormous but brief energy output of a "hydrogen bomb".Except that in the core of the sun, it has been going continuously for billions of years.
In a transition to ground state, a photon is radiated away. It carries off the energy to make a transition to ground state possible. As soon as it is created, the photon is off to the races. It travels away at the speed of light (for the medium in which it is moving).
This fact can explain with the help of nuclear fusion in small stars and massive stars in small stars like our sun nuclear fusion followed by the proton -proton chain reaction in which main products are positron, gamma ray photon, neutrino and isotopes of hydrogen and helium and energy released in millions of electron volts but in the case of massive stars nuclear fusion is followed by the carbon-nitrogen-oxygen cycle and helium can further transform into the carbon by triple alpha process and in the massive star much heavier elements can burn producing very large amount of energy than our sun and some of the massive star can produce luminosity 60000 times more than our sun
The energy of the photon is the same as the energy lost by the electron
Hydrogen and Helium are the first two in the table of elements. Both have several isotopes, but only one stable one each. In our Sun (and most other stars) the fusion of Hydrogen to Helium is the process that gives us our light and heat.
It is believed that a photon of light takes about a million years to travel from the centre of the Sun to the Photosphere. This is because the gamma rays (high-energy photons) released in fusion reactions are absorbed in only a few millimeters of solar plasma and then re-emitted again in random direction and at slightly lower energy.
lower energy level
The energy is released as electromagetic energy and each transition in each atom has its own wavelength for the light emitted.
Stars produce so much energy because of nuclear reactions occuring in their core. Hydrogen atoms are smashing together and fusing into helium through a process known as nuclear fusion which releases huge amounts of energy.