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Suppose that the x rays are emitted from a focal spot isotropically. The photon flux is 3.28 x 106 photons mm-2 sec-1 at a distance of 0.75 m from the focal spot. What is the photon flux at a distance of 10 cm from the focal spot? Neglect the effects of air attenuation.
Determine the divergence of the vector field at (1, 1, 0).
What do you understand by rectifier? Illustrate working of half wave and full wave rectifiers with diagrams. Show the expression for its efficiency? Define a transistor and illu
#question.1) [chp 2; NC] You drop a superball from your dormitory window, a height, h=30 m, above the ground. 1 s after this your friend shoots a superball straight upward toward t
Mass of the system is same. since, p=mv momentum remains same
The symmetrical scissors truss shown below is supported at point A and D. The support at D is a rocker bearing and does not produce a horizontal reaction. A, B, C, D, E & F are pi
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
applications of joule''s law?
What are the demerits of Huygens' eyepiece? The angles of deviations for violet and red colors of a crown prism are 5.23 o and 5.15 o respectively. Determine the dispersive po
Explain power of a lens. What is the principle of an optical fibre? What is a thin prism? Describe angular dispersion between two colours for a prism.
A convex lens of refractive index 1.5 of focal length 0.2m is immersed in water of refractive index 1.33. Determine the focal length of lens in water.
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