Physics

Problem

Which one of the following pairs of frequencies will produce the slowest audible beats when sounded together? a)

400\ \text{Hz and}\ 410\ \text{Hz}

256\ \text{Hz and}\ 259\ \text{Hz}

300\ \text{Hz and}\ 308\ \text{Hz}

512\ \text{Hz and}\ 520\ \text{Hz}