EM Waves can have wavelengths that are thousands of miles long at the highest frequencies.

The statement about electromagnetic (EM) waves having wavelengths that are thousands of miles long at the highest frequencies is not accurate. In the electromagnetic spectrum, higher frequencies correspond to shorter wavelengths. For instance, radio waves, which are considered relatively low-frequency EM waves, can have longer wavelengths, sometimes stretching to thousands of miles. However, as the frequency increases, such as with visible light or gamma rays, the wavelengths become much shorter, reaching into the nanometer or even picometer range. Therefore, the correct answer points out that the original statement is false, since high frequencies do not coincide with long wavelengths. Understanding this relationship between frequency and wavelength is essential for grasping the properties of electromagnetic radiation.