การบ้านวันจันทร์ที่ 8 ธันวาคม 2551
1.) 20 log (4*3.14*3) + 10*2 log (9)
0.13 3
= 1.30 (37.68) + 1.30 *0.26
0.13
= 377 + 0.33= 377.33 dB
2.) 20 log (4*3.14*3) + 10*2 log (8)
0.13 3
1.30 (37.68) + 1.30 * 0.43
0.13
= 377 + 0.65
= 377.65 dB
3.) 20 log (4*3.14*3) + 10*2 log (17)
0.13 3
= 1.30 (37.68) + 1.30 * 0.8
0.13
= 377 + 1.092
= 378.092 dB
4.) 20 log (4*3.14*3) + 10*2 log (20)
0.13 3
= 1.30 (37.68) + 1.30 * 0.84
0.13
= 377 +1.092
= 378.092 dB
5.) 20 log (4*3.14*3) + 10*2 log (33)
0.13 3
= 1.30 (37.68)+1.30*1.04
0.13
= 377 + 1.352
= 378.35 dB
6.) 20 log (4*3.14*3) + 10*2 log (45)
0.13 3
= 1.30 (37.68)+10*2 log (45)
0.13 3
= 377 +1.56
= 378.60 dB
7.) 20 log(4*3.14*3) + 10*2 log (50)
0.13 3
= 1.30 (37.68) + 1.30*1.23
0.13
377 +1.7
= 380 dB
8.) 20 log (4*3.14*3) + 10*2 log (60)
0.13 3
= 1.30 (37.68) +1.30*1.30
0.13
= 377 +1.7
= 380 dB
9.) 20 log (4*3.14*3)+10*2 log (37)
0.13 3
= 1.30 (37.68) +1.30*1.1
0.13
377 +1.43
= 378.43 dB
10.) 20 log (4*3.14*3) +10*2 log (10)
0.13 3
= 1.30 (37.68) +1.30*0.51
0.13
= 377+0.7
= 378 dB
การหาค่าของ LP
1.) LP = 20 log (4*3.14*9) +2*21+2*4.5
0.13= 1.30 (113.04) +42+9
0.13= (1.30*870)+51= 1182 LP
2.) LP = 20 log (4*3.14*8)+2*21+2*4.5
0.13= 1.30*33.5 +51= 94.55 LP
3.) LP = 20 log (4*3.14*17) + 2*21+2*4.5
0.13= 1.30*71.20+51= 143.6 LP
4.) LP = 20 log (4*3.14*20)+2*21+2*4.5
0.13= 1.30*84+51= 160.2 LP
5.) LP = 20 log (4*3.14*33) + 2*21+2*4.5
0.13= 1.30*3190+51= 4200 LP
6.) LP =20 log (4*3.14*45) +2*21+2*4.5
0.13= 1.30*4347.7+51= 5703.01 LP
7.) LP 20 log (4*3.14*50) +2*21+2*4.5
0.13= 1.30*3575+51= 4698.5 LP
8.) LP = 20 log (4*3.14*60) +2*21+2*4.5
0.13= 1.30 *5797+51= 7587.1 LP
9.) LP =20 log (4*3.14*37) +2*21+2*4.5
0.13= 1.30*3575+51= 4698.5 LP
10.) LP = 20 log (4*3.14*10) +2*21+2*4.5
0.13= 1.30*966.15+51= 1307 LP
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