Consider: radio waves (r), visible light (v), infrared light (i), x-rays (x), and ultraviolet light (u). In order of increasing frequency, they are ?
Answer: r, i, v, u, x
Explanation
The electromagnetic spectrum in order of increasing frequency (and energy) is:
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Radio waves (lowest frequency)
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Infrared (i)
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Visible light (v)
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Ultraviolet (u)
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X-rays (x) (highest frequency among these)
So, the correct sequence from lowest to highest frequency is:
radio (r) < infrared (i) < visible (v) < ultraviolet (u) < x-rays (x)
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