The formula which gives the distribution of sound energy along a corridor radiated by a simple source of sound located in it, has been derived in connection with ratio of the height H and the breadth B and the absorption coefficients (α_ω1, α_ω2, α_c and α_f)of its walls, ceiling and floor. The results of numerical calculation of the formula were also presented for the case of H/B: 1, 1. 5 and 2, α_f:0. 03, α_ω:0. 2〜1. 0 and α_c:0. 2 〜0. 8. The calculated distribution shows good agreement with the observed distribution.
