Jawaban:

1. Rumus di bawah

2000 = 1700 (340 + vp) / (340 - 0)

2000*340 /1700 = 340+vp

400 = 340 + vp

vp = 400 - 340 = 60 m/s

2.

Ambulan mendekati vs = -25 m/s    vp=0

fp/fs = (325 + 0) / (325-25)

fp/fs = 325/300 = 1,0833

3.

Faris mendengar suara Faros  

Faris diam  vp = 0

Faros mendekat vs = -2 m/s

fp = 676 (340 - 0) / (340 - 2)

fp = 676 *340/338

fp = 680 Hz

Pelayangan bunyi = selisihnya = 680 - 676 = 4 Hz

4.

I = P/4πr^2

I6 / I3 = (P/4π 6^2)/ (P/4π 3^2)

I6/I3 = 9/36

I6 = 0,25 x I3 = 0,25x10^-7   W/m^2

5.

Lima mesi TI5 = 50 dB

TI60 = ?

n = 60/5 = 12

TIn = TI1 + 10 log 12

TIn = 50 + 10,79 = 60,79 dB

6.

I = P/A

A = 4πr^2 = 4π*(20)^2 = 1600π m^2

I = 80π/1600π = 0,05 W/m^2

TI = 10 log (0,05/10^-12)

TI = 106,9 dB

Penjelasan: