Question: Plz DO ASAP & don't Copy Chegg otherwise I will report A ventilation duct that can be considered as a waveguide is Lx=1 m wide

Plz DO ASAP & don't Copy Chegg otherwise I will report

A ventilation duct that can be considered as a waveguide is Lx=1 m wide and Ly= 0.25 m high. a) What would be the maximum frequency of sound propagating, for only the plane waves to exist in the waveguide? b) Which modes carry the sound to large distances if the frequency of a source in the waveguide is 250 Hz? c) If the frequency of a source in the waveguide is 150 Hz and the (1,0) mode is excited near the source, how many meters will it take for the (1,0) mode to diminish to half its amplitude

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