Nuclear fusion reactions occur spontaneously in:
Sun
Nuclear fusion is the process in which two light atomic nuclei combine to form a heavier nucleus, releasing enormous amounts of energy. It requires extremely high temperatures (of the order of tens of millions of degrees) and very high pressures so that the positively charged nuclei can overcome their mutual electrostatic repulsion.
These conditions exist naturally in the core of the Sun and other stars, where hydrogen nuclei fuse into helium in the proton-proton chain, producing the sunlight and heat that reach the Earth. Nuclear reactors on Earth run on nuclear fission (splitting of heavy nuclei), not fusion; the Earth's core is molten but nowhere near hot enough for fusion; and ocean waves are a mechanical phenomenon with no nuclear processes involved.
Hence, Sun.
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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.
