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WAEC - Physics (2021 - No. 29)

Which of the arrangements of radiations below shows decreasing order of wavelengths? 
 X-rays> radio waves > infrared radiations 
Radio waves> infrared radiations > X-rays 
Infrared radiations > radio waves > X-rays 
 X-rays> infrared radiations > radio waves

توضيح

 radio waves have a longer wavelength than infrared light, and infrared than x-rays in the electromagnetic spectrum.

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