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Consider the following parts of spectra: 1. Visible 2. Infrared 3. Ultraviolet 4. Microwave Which one of the following is the correct sequence in which their wavelengths increase?

Consider the following parts of spectra: 1. Visible 2. Infrared 3. Ultraviolet 4. Microwave Which one of the following is the correct sequence in which their wavelengths increase? Correct Answer 3 – 1 – 2 – 4

CONCEPT:

Spectrum: It is an arrangement of all the possible electromagnetic waves in terms of wavelength and energy.

  • E = hν = hc / λ

 

  • Visible spectrum Lies between – Approx. 400nm to 700nm (4 × 10-7 to 7 × 10-7) m.
  • Infrared lies between –Approx. 700nm to 1mm (7 × 10-7 to 1 × 10-3) m.
  • Ultraviolet lies between – Approx. 10nm to 400 nm (10 × 10-7 to 4 × 10-3) m.
  • Microwave lies between – Approx. 1mm to 1 m (1 × 10-3 to 1) m.

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  • Energy increases when we go from radio to gamma rays.
  • Wavelength decreases simultaneously.

 

EXPLANATION:

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Arranging the sequence.

  • Wavelength increasing term
  • Ultraviolent > Visible light > Infra-red > Microwave.
  • 3 – 1 – 2 - 4

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