Question

The decreasing order of wavelength of infrared, microwave, ultraviolet and gamma rays is

• A. microwave, infrared, ultraviolet, gamma rays
• B. infrared, microwave, ultraviolet, gamma rays
• C. gamma rays, ultraviolet, infrared, microwaves
• D. microwaves, gamma rays, infrared, ultraviolet

Answer 1

Answer: (A)

microwave, infrared, ultraviolet, gamma rays

The decreasing order of the wavelength for the given rays is opposite to the order of their frequencies because the frequency of the wave is inversely proportional to the wavelength.

$\nu \propto \frac{1}{\lambda }$

The order of frequency for the waves is

microwave$<$ infrared$<$ UV$<$ gamma rays.

Therefore, the decreasing order wavelength is: microwave$>$infrared$>$UV$>$ gamma rays