คลื่นเสียง - PCCCHON

1 5 1 2558 - .. 1 1. (Sound wave)

2 (Sound pressure) (Compression) (Rarefaction) 1 : 2 2 2 : 2 3.

3 3 )sin(tkxPPA .. (1) )cos(tkxAy )2sin( tkxAy .. (2) 5 (m/s) (m/s) (m/s) (0 C) (20 C) (0 C) (0 C) (0 C) 331 343 1286 317 972 (25 C)

4 1493 1143 1533 5100 3560 5130 1322 3 fv tsv Tv Tkv.

5 (3) 273 K 0 C 331 273331k .. (4) (4)/(3) Tkkv273331 Tv20 tkv 273 .. (5) (5)/(4) 273273331tv 273273331tv 2731331tv 211xx )2(2731331tv ))2(2731(331tv tv)2(273331331 Tv20 1120Tv 2220Tv x 4 1212 TTvv.

6 (6) (Young s modulus) (Density) Yv .. (7) Y , B (Bulk modulus) (Density) Bv ..(8) B , Pv.

7 (9) vpcc P , , PC , VC 1 300 .. 5 2 25 .. 2. 4 1.

8 - 180 - 2. 6 (Echo)

9 Vtd 2 d v t 3 1,000 340 .. (Snell s law)

10