1)

Let  S1  be the amount of Rayleigh scattered light of wavelength  λ1 and S2 that of light of wavelength λ2  from a particle  of size a. Which of the following statement is true?


A) S1S2=(λ2λ1)4,ifλ1,λ2>>a

B) S1S2=(λ1λ2)4,ifλ1,λ2>>a

C) S1S2=(λ2λ1)4,ifλ1,λ2<<a

D) S1S2=(λ1λ2)4,ifλ1,λ2<<a

Answer:

Option A

Explanation:

 Condition for scattering is 

   λ  >> a

 and according to Rayleigh , intensity (or amount ) of  scattered wavelength  is inversely proportional to fourth power of the wavelength  of incident wave, 

 i.e,

    s1λ4S1S2=(λ2λ1)4 and λ>>a