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Q4 (UPPCS/2025) Science & Technology › Basic Science (Physics, Chemistry, Biology)

Arrange the following electromagnetic radiations in decreasing order of their frequencies.
1. Gamma rays
2. Ultraviolet rays
3. Radio waves
4. X-rays
Select the correct answer from the code given below :
Code :

Result
Your answer: —  Â·  Correct: D

Explanation

The electromagnetic (EM) spectrum arranges radiations based on their frequency or wavelength. Frequency (ν) is inversely proportional to wavelength (λ). In the EM spectrum, the order of radiations from highest frequency (shortest wavelength) to lowest frequency (longest wavelength) is:

  1. Gamma rays: Highest frequency (typically > 1019 Hz) and highest energy.
  2. X-rays: Frequencies ranging from 1016 to 1019 Hz.
  3. Ultraviolet (UV) rays: Frequencies ranging from 1015 to 1016 Hz.
  4. Visible light
  5. Infrared
  6. Microwaves
  7. Radio waves: Lowest frequency (typically < 109 Hz) and longest wavelength.

Therefore, the decreasing order of frequency for the given radiations is Gamma rays (1) > X-rays (4) > Ultraviolet rays (2) > Radio waves (3), which corresponds to the sequence 1, 4, 2, 3.

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