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Fermat's principle; principle of least time (P. de Fermat):
The principle put by P. de Fermat, which states the path taken through a ray of light among any two points into a system is always the path which takes the least time.
Is the earth the perpetual motion machine
Two concentric conducting shells a and b are of radii R and 2R. A charge +q is centred at their center. Shell b is then earthed and a is given charge q. Find the charge on outer su
2. Surface Crystallography and Epitaxy Fe thin films are grown on a single-crystal Al (100) substrate surface. The films grow with no dislocations (if they are thin enough) which
Explain thew laws of physics It is thought that the laws of physics do not change from place to place. This is why experiments carried out in different countries by dissimilar
A figure skater who while spinning in place drag her arms in to increase her rotational speed is most closely exhibiting which of the following Answer:- a) Conservation of
Q. The resistance of a nichrome wire at 0oC is 10 Ω. If the temperature coefficient of resistance is 0.004/ o C, find its resistance at boiling point of water. Comment on the resul
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Michelson-Morley experiment (A.A. Michelson, E.W. Morley; 1887) Probably the most popular null-experiment of all time, designed to check the presence of the proposed "lumenife
Randomly polarized light (such as sun light) with intensity of I 0 passes through three polarizers (P 1 , P 2 , P 3 ) consecutively. P 1 and P 3 are stationary, and their polar
after 1sec of projectile makes an angle of 45 with the horizontal after another 1 sec travelling horizontally find magnitude of initial velocity and angle of projection
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