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The electromagnetic radiations are in descending order of wavelengths in the following sequence

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Radio waves, visible light, infra-red waves, X-rays

X-rays, visible light, infra-red wave, radio waves

infra-red waves, radio waves, X-rays, visible light rays

Radio-waves, infra-red waves, visible light,X-rays

answer is B.

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Detailed Solution

Wave length of X rays is from 0.01 to 10 nm .

Wavelength of visible light is from 400nm to 700 nm

Wavelength of infrared waves (thermal radiation ) is from 780 nm to 1 mm

Wavelength of radio waves is above 30 cm

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