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Coefficient of viscosity is the ratio of shearing stress to the velocity gradient of the fluid.

Scalar Product of Vectors

The scalar product and the vector product are the two ways of multiplying vectors which see the most application in physics and astronomy. The scalar product of two vectors can be constructed by taking the component of one vector in the direction of the other and multiplying it times the magnitude of the other vector. This can be expressed in the form:

A(VECTOR).B(VECTOR)=ABCOS(Ɵ)

If the vectors are expressed in terms of unit vectors i, j, and k along the x, y, and z directions, the scalar product can also be expressed in the form:The scalar product is also called the "inner product" or the "dot product" .

Coherent sources are defined as the sources in the which initial phase difference remains constant. In the case of two independent sources, the initial phase difference cannot remain constant because the light is emitted due to millions of atoms and their number goes on changing in a quite random manner.

In the decreasing order of refractive index

 µb< µy <µr

Coherent sources are defined as the sources in which the initial phase difference remains constant.

Keeping that in mind if we try thinking about the source of two independent light rays, we will come to an understanding that we don't have any idea, about the phases of these sources.

So we cant say, they are Coherent.

Being two different sources and still in the same phase, the chances of this happening is next to impossible.

Dear Student, I would like to telll you that Science is a very interesting subject. Sometimes students feel the subject difficult due to lack of teaching. Most of the science topics are correlated to our day to day life and everyday activities. Science is upIf you will learn and develp your undertsanding of the subject by correlating the topics with real life, you will find them very simple, interesting and easy. 

The gap between the conduction band and valence band is called energy band gap.

The unbalance cohesive force per unit length is known as surface tension or it is also defined as work done in an unit area. It's Si unit is N/m and J/m². It's dimension is M¹L^0T^-2.,

The main good sides of the Friction are : i) It helps us in walking on ithe ground properly without slipping, ii) It helps us keep our palms warm during winter on rubbing, iii) It enables the car come to rest slowly by applying brakes.

Barkhausen criterion is applicable to oscillators. It provides a set of conditions for sustained oscillations.Oscillators work on the principle of positive feedback or regenerative feedback. That is, a fraction of output (from amplifier) is taken and added back to input with proper MaGnitude and phase. By doing so, output regenerates eventhough input is removed. However, to Make it happen, Barkhausen criterion has to be satisfied which states:

(1) Magnitude of overall gain around the loop should be unity.