Final answer:
Infrared waves have a lower frequency compared to ultraviolet waves. Infrared radiation sits below red light in the electromagnetic spectrum, while ultraviolet radiation is above violet light, with higher frequencies and shorter wavelengths.
Step-by-step explanation:
Compared to ultraviolet waves, the frequency of infrared waves is lower. In the electromagnetic spectrum, infrared rays have lower frequencies and longer wavelengths than visible light, which includes the violet light at the higher frequency end of the spectrum that we can see.
Since ultraviolet rays are just beyond violet light in the spectrum, they have frequencies that are even higher than visible light, and therefore, higher than infrared. Therefore, part B of the question would be infrared radiation as it has lower frequencies than red light (which is at the low-frequency end of the visible spectrum), and part C would be ultraviolet radiation since it has shorter wavelengths and higher frequencies than violet light.