Final answer:
Blue light has a higher frequency than red light due to its shorter wavelength. Violet or blue light represents the high-frequency end of the visible spectrum while red light sits at the low-frequency end.
Step-by-step explanation:
The frequency of light is inversely proportional to its wavelength, meaning that as the wavelength increases, the frequency decreases. In the electromagnetic spectrum, blue light has a shorter wavelength and therefore a higher frequency compared to red light, which has a longer wavelength and a lower frequency. This is why blue flames are hotter than red flames; the blue light is indicative of a higher frequency and energy level.
When comparing light within the visible spectrum, violet (or blue) light has the highest frequencies and shortest wavelengths, while red light has the lowest frequencies and longest wavelengths. For instance, ultraviolet radiation has even shorter wavelengths and higher frequencies than violet light, while infrared radiation has longer wavelengths and lower frequencies than red light.