Complete the statements relating to the electromagnetic spectrum. waves have the longest wavelengths. waves have the highest frequencies. waves have frequencies between 7.5 × 10 14 Hz and 3.0 × 10 16 Hz. waves have wavelengths between about 3 mm and 3 m. waves are often used in night‑vision applications. waves can be seen with the naked eye. waves can be created by colliding high‑velocity electrons with a metal target.