--%>
Assignment Help - homework help

Explain Hawking radiation

Hawking radiation (S.W. Hawking; 1973): The theory which black holes emit radiation similar to any other hot body. The virtual particle-antiparticle pairs are continuously being made in supposedly empty space. Infrequently, a pair will be made just exterior to the event horizon of a black hole. There are three possibilities as:

•    Both particles are imprisoned by the hole;
•    Both particles flee the hole;
•    One particle flees while another is captured.

The first two situations are straightforward; the virtual particle-antiparticle pair recombines and returns their energy back to the void through the uncertainty principle.

This is the third situation which interests us. In this situation, one of the particles has escaped (and is speeding away to the infinity), whereas the other has been imprisoned by the hole. The escape becomes real and can now be noticed by distant observers. However the captured particle is still virtual; since of this, it has to restore conservation of energy by conveying itself a negative mass-energy. As the hole has absorbed it, the hole loses mass and therefore appears to shrink. From a distance, it comes out as if the hole has released a particle and diminished in mass.

The rate of power emission is proportional to the inverse square of the holes mass; therefore, the smaller a hole gets the faster and faster it emits the Hawking radiation. It leads to a runaway procedure; what happens whenever the hole gets very tiny is not clear; quantum theory seems to point out that some kind of "remnant" may be left behind after the hole has emitted away all of its mass-energy.

   Related Questions in Physics

  • Q : What is baryon decay Baryon decay - The

    Baryon decay -The idea expected by several grand-unified theories, those classes of subatomic particles termed as baryons (of which the nucleons -- neutrons and protons -- are members) are not eventually stable however indeed de

    		•
  • Q : Define Noether theorem Noether theorem

    Noether theorem (Noether): A theorem that explains that symmetries are what gives rise to conserved quantities. For example, the translational symmetry (that is the fact that the laws of physics work the same in all positions) gives r

    		•
  • Q : Explain Lagrange points Lagrange points

    Lagrange points: The points in the vicinity of two massive bodies (like the Earth and Moon) with each others' relevant gravities balance. There are five, labeled L1 via L5. L1, L2, and L3 lie all along the centerline among the centers

    		•
  • Q : Define Atwood's machine Atwood's

    Atwood's machine: The weight-and-pulley system devised to compute the acceleration due to gravity at Earth's surface by computing the total acceleration of a set of weights of identified mass about a frictionless pulley.

    		•
  • Q : How fireworks turn to shapes similar to

    Briefly illustrate how do fireworks turn to shapes similar to hearts and stars?

    		•
  • Q : What is Simultaneity principle

    Simultaneity principle: The principle which all frames of reference will contain invariant simultaneity; that is, the two events perceived as simultaneous (that is, containing the similar time coordinate) in one frame will be apparent as simultaneous

    		•
  • Q : Define Dirac constant Dirac constant :

    Dirac constant: Planck constant, modified form; hbar Sometimes more suitable form of the Planck constant, stated as: hbar = h/(2 pi)

    		•
  • Q : Define Le Chateliers principle Le

    Le Chatelier's principle (H. Le Chatelier; 1888): When a system is in equilibrium, then any modification imposed on the system tends to shift the equilibrium state to decrease the consequence of that applied change.

    		•
  • Q : Brief note on the classification of

    Write down a brief note on the classification of Alloys?

    		•
  • Q : Explain Pascals principle Pascal's

    Pascal's principle: The pressure exerted to an enclosed incompressible static fluid is transmitted undiminished to all portions of the fluid.

    		•