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Luminous flux and LASER:
The luminous flux of a light source is measured in the units of LUMEN (lm). Lumen (lm) is the amount of light emitted per second by uniform (point) source of one candela with in a cone of unit solid angle.
A source having an illuminating power of 1 candela is said to be 1 candle power. A light source is said to be of unit illuminating power or unit luminous intensity if it radiates a flux of 1 lumen through a unit solid angle.
ICBM : Inter Continental Ballistic Missile.
LASER : Light Amplification by Stimulated Emission of Radiation.
Resonance When the frequency of driving force become equal to the natural frequency of an oscillating system, the driving force provides maximum energy and the oscillating syst
The units that may be derived from fundamental units are known as derived units.
Advantages of induction motors 1. Simple design. 2. Low cost compared to other motors of the similar capacity. 3. High overload capacity. 4. Very rugged construction.
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