Optionals IAS Mains Physics: Questions 60 - 65 of 307

It is not always necessary that two superimposing light waves always interfere and result in the redistribution of energy (fringes) . Only where these superimposing waves satisfy certain conditions the fringe pattern is observed on screen. These conditions are as follows:

1. The phase difference between the two waves should not change with time. If the…

• If F is the external force applied to plate P to maintain a laminar streamline flow of the liquid and v, the velocity of the uppermost layer, distant z from the lowermost or stationary layer, we have tangential or shearing stress applied = where A is the surface area of the layer.
• Newton found that the shear strain is a function of the shearing st…

• The Compton Effect experiment gives direct evidence that electromagnetic radiations consist of photons, which colliding with electrons, for example, like one billiard ball colliding with other billiard ball. In figure 1, we show, schematically, the experimental arrangement of Compton Effect. An X-ray bean of known single wavelength from source S fa…

By solving Schrodinger equation for the given potential, we wish to obtain for all . Let as divide the axis into two domains: region and region as shown in figure 1. The Schrodinger equation shall be solved for two cases .

Case I: -

For the two regions , the Schrodinger equation becomes

… eq. (1)

… eq. (2)

• E…

• Conservation of linear momentum: - It follows from Newton՚s second law of motion in the from
• That is, if the total force F is zero then and the linear momentum is conserved. Obviously the conservation law is the result of the first integral of equation of motion. Conservation laws are thus also called the first integrals of equations of motion.
• Con…