Electromagnetic waves are collectively called light and they all have the same velocity which is commonly referred to as the speed of light.
Looking at the waves 1 - 7 shown in the image attached, we can see that all the waves have the same speed even though they have different frequencies and wavelengths.
This implies that the waves, 1 - 7 must all belong to the electromagnetic spectrum. Recall that electromagnetic waves are collectively called light and they all have the same velocity which is commonly referred to as the speed of light.
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