Given the frequency at 528 Hz and the speed of sound, \(\text{331.29 ms}^{-1}\),
\(\lambda=\cfrac{v}{f}=\cfrac{331.29}{528}\)
A fundamental frequency of half a wavelength across the gong,
\(d_g=\cfrac{1}{2}\lambda=\cfrac{1}{2}\cfrac{331.29}{528}=0.3137\)
A gong of diameter 31.37 cm. That's a small gong. You can use a wok or pan of similar size, 32 cm; 528 Hz with white or brown noise from a speaker.
