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

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

AIPMTAIPMT 2011Electromagnetic Waves

Solution:

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.
$v \propto \frac{1}{\lambda}$
The order of frequency for the waves is
microwave $<$ infrared $< UV <$ gamma rays.