Arrange the following electromagnetic radiations in decreasing order of their frequencies:
- 1. Gamma rays
- 2. Ultraviolet rays
- 3. Radio waves
- 4. X-rays
- A4, 1, 3, 2
- B4, 1, 2, 3
- C1, 4, 2, 3
- D1, 4, 3, 2
Show answer and explanation
Correct answer: (c) 1, 4, 2, 3
Explanation
Frequency is inversely proportional to wavelength, so shortest-wavelength radiation has the highest frequency.
Gamma rays have the highest frequency, followed by X-rays, then Ultraviolet rays.
Radio waves have the longest wavelength and lowest frequency, giving the order 1, 4, 2, 3.