Q91 / 180 · AIIMS 2004 · Physics

Sodium lamps are used in foggy conditions because

  • Correct answer
    A
    yellow lightis scattered less by the fog particles
  • B
    yellow light is scattered more by the fog particles
  • C
    yellow light is unaffected during its passage through the fog
  • D
    wavelength of yellow light is the mean of the visible part of the spectrum.

Solution

Sodium lamp light emits monochromatic light i.e. it is comprised of only one wavelength (deep yellow). This colour is scattered less in the foggy condition while other light sources produce light at many different discrete wavelengths and all provide some degree of colour rendering. Also sodium lamps emit light very near to the peak sensitivity of the human eye under normal viewing conditions.

Hence, the correct answer is option: 'A'.

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