Arrange the following electromagnetic waves in the decreasing order of their wavelengths: (A) X-rays (B) Microwaves (C) Ultraviolet rays (D) Infrared rays Choose the correct option:

Step-by-step solution

The electromagnetic spectrum, arranged in decreasing order of wavelength (or increasing order of frequency), is as follows: Radio waves > Microwaves > Infrared > Visible light > Ultraviolet > X-rays > Gamma rays. Comparing the given waves: Microwaves (B) have the longest wavelength (approx. 10⁻² m ). Infrared rays (D) have a shorter wavelength (approx. 10⁻⁴ m ). Ultraviolet rays (C) have an even shorter wavelength (approx. 10⁻⁸ m ). X-rays (A) have the shortest wavelength among the given options (approx. 10⁻¹⁰ m ).