The frequency of beats when two waves of frequencies 512 Hz and 508 Hz superpose is

1. Beats occur when two waves of nearly equal frequencies superpose. 2. The beat frequency is the absolute difference of the two frequencies. 3. |512 − 508| = 4 Hz. 4. So four beats per second are heard. _Source: syllabus Physics, Ch 14 "Waves", §14.7_