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Spectrum and electromagnetic radiations:
What is a spectrum?
Ans: A spectrum is a group of wave lengths or frequencies.
What are the electromagnetic radiations?
Ans: Electromagnetic radiations are characterized by oscillating electric and magnetic fields perpendicular to each other and also perpendicular to the direction of propagation. All these radiations travel with the same speed,that is 3 x 108m/s2.
A horizontal power line carries a current of 6110 A from south to north. Earth's magnetic field (86.8 mT) is directed toward the north and is inclined downward at 70 degrees to the
calculating work
Illustrate the light emitting diode for fibre optic communication? Light-Emitting Diode (LED) for fibre optic communication: There are two types of LED. They are surface etc
Ultraviolet catastrophe: A shortcoming of the Rayleigh-Jeans formula, that tries to explain the radiancy of a blackbody at several frequencies of the electromagnetic spectrum.
VRIFY THE CURRENT DIVIDER RELATION AND VOLTAGES DIVIDER RELATION
Q. What are polar molecules? Give an example. i) A polar molecule is one in that the centre of gravity of the positive charges is separated from the centre of gravity of the ne
A 350-Hz tuning fork is held over the end of a pipe that is inserted into water. What is the spacing between the resonance lengths of the pipe if the speed of sound is 348 m/s
It is the need of elastic strength of a substance when subjected to repeated stresses and strain. If the substance is reserved undisturbed for some time, the previous properties ar
Colour code of resistors: The current method of colour code marking of resistors is the Band System. Close to one end of the resistor are four coloured bands (there may
Who shared the Nobel Prize in Physics in 1909 with Guglielmo Marconi for his contribution to the development of wireless telegraphy? Ans: (Carl Ferdinand) Braun shared the N
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