The longest wavelength.

waveWhich of these waves have the longest wavelength?
a. infrared light
b. ultraviolet light
c. radio waves
d. blue light
e. X-rays
f. yellow light
g. red light

Answer. Posted on Thursday, February 12, 2015.

c. radio waves

Radio waves have the longest wavelength in the Electro Magnetic spectrum. It is between 1mm and 100km.

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