Question

Please very important write this on computer, I would greatly appreciate it.

Include the solution of the problems with the whole procedure clear, complete and organized.

Solve:

1. The Bulk module of the water is 2.0 x 109 N / m2. Use that data to find the speed of sound in the water.

2. Two sound waves interfere with each other at a point causing completely constructive interference. The frequencies of both waves are 550 Hz and 600 Hz respectively. Determine the frequency (fbeat) of the wave pulses.

3. What is the intensity level in decibels for an intensity sound wave of (a) 10-10 W / m2 and (b) 10-2 W / m2?

4. While an ambulance is traveling east on a highway at a speed of 33.5m / s (75mph), its siren emits sound at a frequency of 400Hz. How often will a person traveling in the car ride west at 24.6m / s (55mph) (a) while the car approaches the ambulance and (b) while the car moves away from the ambulance?

Answer 1

1. Speed = v = = = = 1414.21 m/s

2. Beat frequency is difference between two frequencies = 600-550 = 50Hz

3. I (dB) = 10 log₁₀(I/I₀) I₀ = 10^-12 watt/m²

a. I = 10^-10 so I (dB) = 10 log (10^-10/10^-12) = 10x2 = 20

b. I = 10^-2 so I (dB) = 10 log (10^-2/10^-12) = 10x10 = 100

4. Dopper freq = f = (Vs/(Vs+Vr) x f₀

Where V s= Sound velocity

Vr = Relative speed (negative if approaching, positive if going away)

f₀ = frequency at source = 400 Hz

a. Vr = V_ambulance +V_car = 33.5 +24.6 = 58.1( taken negative as car is approaching)

So f = (330/(330-58.1))x 400 = 485.47 Hz

b. Vr = 58.1 taken positive

So f = (330/330+58.1) x 400 = 340.12 Hz