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VISUAL PHOTOMETRY: The branch of science which deals with measurement of brightness or luminous intensities of light emitted by different sources using certain standards and techniques is called visual photometry.
SOLID ANGLE : The ratio of the area of the surface of the portion of a sphere enclosed by the conical surface forming the angle to the square of the radius of the sphere is called solid angle.
LUMEN: Lumen is the amount of light energy emitted per second by a uniform (point) source of one candela with in a cone of unit solid angle.
CANDELA: Candela is defined as the luminous flux emitted per unit solid angle along normal to the surface by one sixtieth (1/60) square cm area of a black body radiator (source) kept at the temperature of solidifying platinum (at 2046 K).
A cue ball has a mass of 0.160 kg is at rest on a frictionless pool table. The ball is hit dead center by a pool stick which applies an impulse of +1.40 Ns to the ball. He ball the
describe the principle, construction and working of Michelson Interferometer.
what is necol prism and give construction and working
Electromagnetic waves are transverse waves; that means magnetic vector and electric vector, propagation vector are perpendicular to each other. Prove the statement mathematically.
A circuit which employs a DIRECT CURRENT source has a branch which has a capacitor. After the circuit has reached a steady state, what is the magnitude of the current in the c
why an electron can''t exist in the nucleus .
Lens: A transport refractive body bonded by one or two spherical surface known as lens. There are various kinds of lenses. e.g. Double convex Lens Double concave lens
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The graph shown in Figure was obtained during an experiment on a diode. (a) What type of diode is this? Give reasons. (b) Determine the forward current for a forward voltage
Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4 A positive charge or
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