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Given below are two statements - one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Rayleigh scattering is responsible for the blue colour of the sky. Reason (R): Rayleigh scattering occurs, when atmospheric particles have diameters that are small relative to the wavelength of radiation Select the correct answer from the options given below:

Given below are two statements - one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Rayleigh scattering is responsible for the blue colour of the sky. Reason (R): Rayleigh scattering occurs, when atmospheric particles have diameters that are small relative to the wavelength of radiation Select the correct answer from the options given below: Correct Answer Both (A) and (R) are true and (R) is the correct explanation of (A)

Atmosphere scattering: Scattering is the redirection of electromagnetic energy by suspended particles in the atmosphere. The type and amount of scattering that occur depending on the size of the particles and the wavelength of the energy. There are three main types of scattering that impact incoming solar radiation:

  1. Rayleigh Scatter
  2. Mie Scatter
  3. Non-Selective Scatter

Rayleigh Scatter:

  • Rayleigh scatter occurs when radiation (light) interacts with molecules and particles in the atmosphere that are smaller in diameter than the wavelength of the incoming radiation.
  • Shorter wavelengths are more readily scattered than longer wavelengths.

  • In digital images, there are different techniques used to minimize the impacts of Rayleigh scatter.
  • At sunrise and sunset, the incoming sunlight travels a longer distance (path length) through the atmosphere.
  • The longer path leads to scattering of the short (blue) wavelengths that are so complete that we only see the longer wavelengths of light, the red and orange.
  • In the absence of particles and scattering the sky would appear black.

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