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The process of vector addtion of individ...

The process of vector addtion of individual displacements of light waves at a point when two or more than two waves arrive at two points is

A

principleof superposition of waves

B

polarisation of light

C

Huygen's construction

D

diffraction of ligth

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A
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A series of pulses, each of amplitude 0.150 m , are sent on a string that is attached to a wall at one end. The pulses are reflected at the wall and travel back along the string without loss of amplitude. When two waves are present on the same string. The net displacement of a given point is the sum of the displacement of the individuals waves at the point. What is the net displacement at point on the spring where two pulses am crossing, (a) if the string is rigidly attached to the post? (b) if the end at which reflection occurs is free is slide up and down ?

Knowledge Check

  • When two light waves meet at a palce

    A
    their displacement add up
    B
    their intensities add up
    C
    both will add up
    D
    Energy becomes zero

  • In interference of light, a point is bright if the path difference between the two beams arriving at that point is

    A
    an integral multiple of the wavelengths
    B
    an odd multiple of the wavelengths
    C
    an odd multiple of half of the wavelengths
    D
    an even multiple of half of the wavelengths

  • If the path difference between the two light waves at a point is equal to intergral multiple of wavelength of then points appears as

    A
    bright
    B
    dark
    C
    may be bright or dark
    D
    none of these

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