19 please Unpolarized light of intensity t_0 passes through three polarizing fil

Question

19 please Unpolarized light of intensity t_0 passes through three polarizing filters. The polarization axis of the first polarizer is vertical. The second polarizer axis makes and angle theta with the vertical. The third polarizer is also vertical. Let t_0 = 5.00 w/m^2 and theta = 30. Find the intensity of the light the light after it passes through the three polarizers 1.41 w/m^2, 1.35 w/m^2, 1.21 w/m^2, 1.00 w/m^3 Two police cars are approaching each other with speed v. Their sirens have a frequency f. Let v = 30m/s, f_s = 256 Hz, and the speed of sound in air that day is c = 345 m/s. Find the frequency of the siren of the left car as is heard by the policewoman in the right car. 294 Hz, 311 Hz, 351 Hz, 305 Hz

Explanation / Answer

19. As unpolarized light passes through polarizer and becomes polzrized.

I = I0/2 = 2.50 W/m^2

after that

I' = I (cos30)^2

If = 2.50 x (cos30)^2 x (cos30)^2 = 1.41 W/m^2

Ans(A)

20. Applying doppler effect,

f= (v + vr)f0 / (v - vs)

f= (345 + 30)(256) / (345-30)

f = 305 Hz

AN(d)

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