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Light of single wavelength is called monochromatic light Example Red light
Light which consists of many wavelengths is called polychromatic Example Sun light
Path difference is the difference between the path travelled by the two waves measured in terms of wavelength
Phase difference tells us how one wave is shifted from other in terms of angle
the relation between these two is phase difference is 2pi by lambda times path difference
where lambda is wavelength
Dispersion is the phenomena in which light of different frequiencies refract by different amount based upon their frequiency values.
Example is white light passing through prism. it splits into seven colours and each colour bends by different angle
Difractionis the bending of light when it meets an obstacle whose size(object) is comparable to the wavelength of light
Example:
Early morning we will see light (sun rays) without seeing sun this is because of diffraction of sun light
To understand this first you should know one of the difference between ordinary source and laser in terms of divergence
ordinary source exhibits the property of divergence where as laser does not
DIVERGENCE: It is the property in which energy will transmitted in all directions
Since laser doesnot exhibit the property of divergence so all the power or energy will be concentrated with in a small area.
so laser is more dangerous compared to ordinary source though their powers are equal
Interference is the phenomenon in which when two or more waves of same frequency move with same velocity in the same direction superpose then the energy of all these waves will be distributed on the screen (space). The region on the screen(space) where there is no energy is called dark band or fringe and where energy is concentrated is called bright band(fringe).
No,The tangent drawn at a point to the electric lines of force gives the direction of electric field at that point. Now if two electric lines of force intersect at a point then we will get two tangents that is two directions of electric field at that point.This is physically impossible situation in which a unit positive charge placed at that point would simultaneously move along two diffeent paths.
Electric field lilnes are vectors.
Electric field lines are imaginary straight or curved path along which a positive test charge is supposed to move when left free.The direction of electric lines of force is the direction in which the positive test charge is supposed to move .
That is they are having direction
so they are vectors
Generally at infinity(at large distance )electric potential is taken as zero
Every magnet has two poles.Each pole has a strength(ability) to attract or repel other pole. This ability is called pole strength.
Magnetic moment is defined as the product of pole strength and length of the magnet.
Length of the magnet is the distance between two poles.
Magnetic moment is a vector quantity.
Its direction is from south pole to north pole
Magnitude of a vector is the square root of sum of squares of each component of a vector
Dot product of two vectors will be zero if the two vectors are perpendicular to each other
Answer is B
for this we have to know the formulea for the force between two charges
In that if we substitute the following units then we will get answer
Force--Newton(N)
Charge-coloumb(C)
Distance-meter(m)
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