The answer is the following:
"what occurs with Doppler effect are changes in frequency due to motion"
The Doppler effect occurs when the source of a wave and the observer are moving relative to each other. Due to this fact, the observer will see the wave moving at a different velocity v' with respect to the real velocity of the wave as emited by the source. As a consequence, the frequency of the wave as seen by the observer is shifted, according to the following relationship:

where:
f' is the apparent frequency, as seen by the observer
f is the real frequency
v is the velocity of the wave
vr is the velocity of the observer relative to the source of the wave (it is positive if the observer is moving towards the source, negative if he is moving away)
<span>vs is the velocity of the source relative to the observer (it is positive if the source is moving away from the observer, negative if it is moving towards him)</span>
Answer:
Short answer, because copper wire does not have high resistance.
Explanation:
Answer:
I₃/Io % = 0.8.59
Explanation:
A polarizer is a complaint sheet for light in the polarization direction and blocks the perpendicular one. When we use two polarizers the transmission between them is described by Malus's law
I = I₀ cos² θ
Let's apply the previous exposures in our case, the light is indicatively not polarized, so the first polarized lets half of the light pass
I₁ = ½ I₀
The light transmitted by the second polarizer
I₂ = I₁ cos² θ
I₂ = (½ I₀) cos2 28
The transmission by the polarizing third is
I₃ = I₂ cos² θ₃
The angle of the third polarizer with respect to the second is
θ₃ = 90-28
θ₃ = 62º
I₃ = (½ I₀ cos² 28 cos² 62)
Let's calculate
I₃ = Io ½ 0.7796 0.2204
I₃ = Io 0.0859
I₃/Io= 0.0859 100
I₃/Io % = 0.8.59
Ir=Initial Intensity/Area of spread=Io4πr2
Ir∝1r2
It is seen from this expression that intensity is inversely proportional to the square of the distance. As we move away from the light source the intensity decreases at the rate of square of the distance from the source.
Brightness being the perception of intensity. more the intensity more bright the object is perceived and vice versa.
Frequency Table
City Frequency
Indianapolis 124
Saint Louis 416
Chicago 1,225
Milwaukee 435
Relative Frequency Table
City Relative Frequency
Indianapolis 124/2200 = 31/550
Saint Louis 416/2200 = 52/275
Chicago 1,225/2200 = 49/88
Milwaukee 435/2200 = 87/440