Stellar Energy Source: Understanding Nuclear Fusion
The primary source of energy in the Sun and other stars is a process called nuclear fusion.
Core Fusion Process
In the intensely hot and dense core of stars, light atomic nuclei are forced together and fuse to form heavier nuclei. For stars like our Sun, this predominantly involves the fusion of hydrogen nuclei (protons) into helium nuclei.
Energy Release Mechanism
This nuclear fusion process releases a vast amount of energy. A tiny fraction of the mass of the fusing nuclei is converted directly into energy, according to the mass-energy equivalence principle described by Albert Einstein's equation $E=mc^2$. This energy radiates outwards, making the star shine.
Why Other Options Are Incorrect
- Nuclear Fission: This is the splitting of heavy atomic nuclei (like uranium), which is used in nuclear power plants but is not the main energy source for stars like the Sun.
- Burning of Helium/Hydrogen Gas: Burning refers to chemical combustion, a much lower-energy process than nuclear reactions. While stars fuse hydrogen and later helium, it's through nuclear fusion, not simple burning.
Conclusion
Therefore, nuclear fusion is the correct explanation for the immense energy output of stars.
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Important Questions from Physics
What is the colour of the light emitted by the Sun?
Lightning occur in the sky when two clouds:
With reference to street-lighting, how do sodium lamps differ from LED lamps?
1. Sodium lamps produce light in 360 degrees but it is not so in the case of LED lamps.
2. As street lights, sodium lamps have a longer life span than LED lamps.
3. The spectrum of visible light from sodium lamps is almost monochromatic while LED lamps offer significant colour advantages in street lighting.
Select the correct answer using the code given below.
Which one of the following is a reason why astronomical distances are measured in light-years?
In a pressure cooker, the temperature at which the food is cooked depends mainly upon which of the following?
1. Area of the hole in the lid
2. Temperature of the flame
3. Weight of the lid
Select the correct answer using the code given below.
