Which is the correct ascending order of the electromagnetic spectrum in terms of increasing frequency?

Correct answer: (d) Radio < infrared < visible < UV < gamma

Explanation

In order of increasing frequency (and decreasing wavelength), the electromagnetic spectrum runs:

radio waves < microwaves < infrared < visible light < ultraviolet < X-rays < gamma rays.

So of the five named, the order is radio < infrared < visible < UV < gamma. Frequency and wavelength are linked by c = fλ, so the shortest waves (gamma rays) have the highest frequency and energy.