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(a) What is the essential condition for ...

(a) What is the essential condition for Rayleigh scattering ?
(b) In Rayleigh scattering, how is intensity of scattered light related to wavelength of light ?

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(a) The essential condition for Rayleigh scattering is that size of scatterer (x) must be far less than the wavelength of light.
(b) The intensity of scattered light (I_s) varies inversely as the fourth power of wavelenth (lamda) i.e., `I_s prop (1)/(lamda^4)`.
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Knowledge Check

  • According to Rayleigh scattering law ,

    A
    the light of only longer wavelengths is scattered more in earth's atmosphere.
    B
    small sized dust particles scatter perferentially smaller wavelengths of light
    C
    the large size dust particles scatter only light of short wavelengths
    D
    the light coming from sodium lamps show Rayleigh scattering very effeciently by large sized dust particles.

  • During scattering of light, the amount of scattering is inversely proportional to of wavelength of light

    A
    square
    B
    fourth power
    C
    half
    D
    cube

  • In terms of wavelength of light (lamda) , intensity (I) of scattered light is related as

    A
    `Iproplamda^(4)`
    B
    `Ipropu^(2)`
    C
    `Iprop1/lamda^(2)`
    D
    `Iprop1/lamda^(4)`

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    What is meant by scattering of light ?

    Assertion : The blue colour of sky is on account of scattering of sun light. Reason : The intensity of scattered light varies inversely as the & fourth power of wavelength of the light.

    Light scattering takes place in

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