with units please Carol lives 1.65 km from Fenway park. She can judge the progre

Question

with units please

Carol lives 1.65 km from Fenway park. She can judge the progress of the games there from the crowd roar, which she hears coming to her window and as brought via the radio. (Assume the radio signal travels direct frm the field, not via station equipment elsewhere.) On one occasion the crowd roar for a home run peaks at t=0. At what time does the radio signal peak, and at what time does the peak roar rattle her window? (Label your two answers appropriately.). Part of the energy rattled her windows at a frequency of 120 Hz. What is the wavelength of that part?. An organ pipe is effectively open at one end, closed at the other, and has a second overtone frequency of 330 Hz. How long is the pipe?. What should be the first overtone frequency for this pipe?. A wave disturbance is described by the function. What is the wavelength of this wave?. What is the wave disturbance at (50 cm,-25 cm, 10 cm) at 8.0 s?.

Explanation / Answer

1) a) t sound=1.65E3/343=4.81 s

tradio = 1.65E3/3.0E8=5.5E-6

so radio sign peaks at 5.5E-6 s

roat at her window at 4.81 s

b) lambda f = v
lambda = 343/120=2.85 m

2) a) f = odd number v/(4 L)
second over tone means odd number = 5

330 = 5*343/(4*L)
L=1.3 m

b) first overtone is number = 3

f = 3*343/(4*1.3)=197.9 Hz

3) a) we can see that k = 2*pi*4/1.2 = 2 pi/wavelength

wavelength = 1.2/4 = 0.3 m

b) J = -2.8*sin(2*pi/1.2*(4*-0.25+8)-pi/2)= 1.4 A/m^2 khat

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