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Olbers' paradox (H. Olbers; 1826):
If the Universe is uniform, infinite & unchanging then the whole sky at night would be bright regarding as bright as the Sun. The further you looked out to space, the more stars there would be, and therefore in any direction wherein you looked your line-of-sight would impinge upon a star eventually. The paradox is resolved through the big bang theory, which puts forth that the Universe is dynamic, non-uniform and (probably) finite.
Presumptuous that it is understood that the object is in front of the mirror and anything on the other side of the mirror is behind the mirror is the following statement sufficient
Q. What is excitation potential energy of an atom? The energy required to increase an atom from its normal state into an excited state is called excitation potential energy of
determine the neutral point in a system of two unlike charges seperated by a distance
Q. A capacitor of capacitance 2 μF is in an ac circuit of 1000 Hz. Compute the reactance of it. Solution: Capacitive reactance XC = 1 / ω C = 1 / 2π ν C =
What is a zone plate? How is it constructed? Show that a zone plate behaves like a convex lens. Deduce the expression for its focal length
A body of mass m1 , moving with velocity u1 collides head on with a body of mass m2 moving with a velocity u2 the two bodies stick together after the collision the loss of kinetic
Capacitor: A capacitor is a device used to kept charge and electrical energy. The stored electrical energy in a capacitor can be utilized according to the need. Factors on w
In free space electric field intensity is provided as E= y 20 cos (ωt-50x) volt/m. Determine displacement current density.
84.1grams of He are compressed reversibly and isothermal at 100.0C from 28.0Litre to 7.37Litres. Calculate the the entropy change in joules/K.
Cosmic censorship conjecture (R. Penrose, 1979) The conjecture, so far completely undemonstrated in the context of general relativity, that all singularities (along the possib
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