Final answer:
The statement is false. Electromagnetic waves with the longest wavelengths actually have the lowest frequencies, with radio waves having the longest wavelengths and gamma rays having the shortest.
Step-by-step explanation:
The statement "Electromagnetic waves with the longest wavelengths have the highest frequencies" is false. In fact, the relationship between wavelength and frequency is inversely proportional, meaning that as the wavelength increases, the frequency decreases. Electromagnetic waves span a wide range in the electromagnetic spectrum, with radio waves having the longest wavelengths and lowest frequencies, while gamma rays have the shortest wavelengths and highest frequencies. For example, red light has a longer wavelength and therefore a lower frequency than blue light, and of the two, blue light carries more energy.