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

Microwaves, Infrared, ultraviolet, gamma rays.

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Infrared, Microwaves, ultraviolet, gamma rays.

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ultraviolet, gamma rays, Infrared, Microwaves

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Microwaves, gamma rays, Infrared, ultraviolet

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Solution

The correct option is A Microwaves, Infrared, ultraviolet, gamma rays.
The wavelength of the Electromagnetic waves is inversely proportional to the frequency of the wave. The frequency of the gamma rays is highest whereas the ultraviolet, Infrared and microwaves follow in decreasing order.
Therefore, the decreasing order of wavelengths will be opposite to the frequency order. So, the microwaves have the longest wavelength and the gamma rays have the smallest.

Microwave $>$ Infrared $>$ Ultraviolet $>$ Gamma ray.

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