Find the numerical value of the lowest resonant frequency 0 and the exact half-width of

Find the numerical value of the lowest resonant frequency ω₀ and the exact half-width " of the resonant cavity God instructed Moses to build in Exodus 25:10-11: “Make an ark of acacia-wood: two cubits and a half shall be the length thereof, and a cubit and a half the breadth thereof, and a cubit and a half the height thereof. And thou shalt overlay it with pure gold.”