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The decreasing order of wavelength of infrared, microwave, ultraviolet and gamma rays is
A
Infrared, microwave, ultraviolet, gamma rays
B
Microwave, infrared, ultraviolet, gamma rays
C
Gamma rays, ultraviolet, infrared, microwaves
D
Microwaves, gamma rays, infrared, ultraviolet
Detailed Solution
The electromagnetic spectrum in order of decreasing wavelength is: radio waves, microwaves, infrared, visible, ultraviolet, X-rays, gamma rays.
Typical wavelengths: microwaves about $10^{-1}$ to $10^{-3}$ m, infrared about $10^{-3}$ to $7\times10^{-7}$ m, ultraviolet about $4\times10^{-7}$ to $10^{-9}$ m, gamma rays less than $10^{-12}$ m.
Picking the four given radiations in this order gives microwave > infrared > ultraviolet > gamma rays.
Hence the decreasing order of wavelength is microwave, infrared, ultraviolet, gamma rays.
Typical wavelengths: microwaves about $10^{-1}$ to $10^{-3}$ m, infrared about $10^{-3}$ to $7\times10^{-7}$ m, ultraviolet about $4\times10^{-7}$ to $10^{-9}$ m, gamma rays less than $10^{-12}$ m.
Picking the four given radiations in this order gives microwave > infrared > ultraviolet > gamma rays.
Hence the decreasing order of wavelength is microwave, infrared, ultraviolet, gamma rays.