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Event horizon:
The radius which a spherical mass has to be compressed to transform it in a black hole, or the radius at which space and time switch responsibilities. Once inside the event horizon, it is impossible fundamentally to escape to the outside. In addition, nothing can prevent a particle from hitting the singularity within extremely short amount of proper time once it has entered the horizon. In this case, the event horizon is a "point of no return."
For generalized black holes (in geometrized units) the radius of the event horizon, r, is
r = m + (m2 - q2 - s/m2)1/2,
Where m refers to the mass of the hole, q refers to its electric charge, and s refer to its angular momentum.
Dual Nature of Light: As light is accepted as a form of waves as well as packets of photon. This nature of light is known as dual nature of light.
what will happen if gravity becomes zero?is it possible in earth?
Action and reaction in polling forces Secure two spring balances. Make a loop in every end of a short piece of strong cord. Join a spring balance to each end and have two pupil
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Radial is exactly centripetal force?
(1) Directive properties: When a magnet suspended freely it remains in the earth's N-S direction (in magnetic meridian). (2) Monopole concept: If a magnet is broken into number
Q. Collector current I c =20 mA and base current I b = 50 A. Find current gain β of a transistor. β = I C / I B = 20 X 10 -3 / 50 X 10 -6 = 400
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