## Coincidence Frequency Measurement

f _{c} = [ sqrt(3)c^{2}/pi*d ] * [ sqrt(ρ/Y) ]

where,

f_{c} = Coincidence Frequency [Hz]

c = Speed of sound in air [ms^{-1}]

d = Thickness of panel [m]

ρ = Density of panel [kgm^{-3}]

Y = Young\'s modulus of panel [Nm^{-2}]