Question

Write a note on the blackholes.Answer the given question in detail.

Answer 1

1. A Black hole is a region in the space from which nothing can escape.
2. When outward (internally developed) pressure is not sufficient to overcome the gravitation force to star; gravitation collapse occurs. Hence massive star, at the end of its life cycle starts collapsing and become supernova. Finally it is turned into black hole.
3. When black hole is formed it can continue to grow in mass by absorbing mass from surroundings and may become super massive black hole with millions of solar mass.
4. At the centre of the most of the galaxies, black holes are found. At the center of our Akash Ganga galaxy a black hole of more than 4 million solar mass is present.
5. There is a imaginary surface belt around hole, called event horizon. Which a warning marks of no return to anybody. Even the light reaching event horizon, get absorbed like a black body in thermodynamics, so it is called black.
6. Temperature of a black hole is inversely proportional to its mass, hence it radiate (or emit energy) by small amount.
7. Existence or presence of black hole can be concluded by observing its gravitational interaction with its surrounding celestial objects.
8. Classification of black hole is based on their mass, electric charge and angular momentum.