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_{PH203KUZMASPRING2015}
Find frequencies of $\lambda=800\,$nm (deep red) and $\lambda=400\,$nm (violet) light. These roughly correspond to the limits of what our eyes can see.
Steps:
Find the maximum E and B fields of a green light source with the average intensity corresponding to the “threshold of pain” ($I=1000\,\frac{\text W}{\,{\text m}^2}$).
Steps:
Assume the solar sail density is comparable to that of diamond $\big(\rho=3500\,\frac{\text{kg}}{\,{\text m}^3}\!\big)$, and that it completely reflects all incident sunlight. Find the maximum thickness of the sail that can be totally supported by the sunlight against the Sun's gravity
(Hint: both the sunlight intensity and gravity drop off with the square of the distance. Therefore, you can pick any position to do your calculation, such as the Earth orbit.
Hint #2: pick any area of the sail, such as 1 m^{2}. In the end, it should cancel out.)
Equations and values:
Steps:
Question: This problem is very confusing where is this concept explained in the book?
Unpolarized light of average intensity $I_0$ is passed (normally = perpendicular to) through two polarizers (one after another) with polarization axes at an angle $\alpha$ relative to each other. Find the average intensity $I_2$ of the transmitted light.
Steps:
video 2.3: How do polarized sunglasses work? |
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Unpolarized light of average intensity $I_0$ is passed (normally) through polarizers 1 and 3 that have their polarization axes perpendicular $\left(\frac{\pi}{2}\right)$ relative to each other. Find the average intensity $I_3$ of the transmitted light. Then, polarizer 2 is inserted between polarizers 1 and 3. The polarization axis of the inserted polarizer 2 is at an angle $\beta$ relative to the axis of the first polarizer. Find the average intensity $I_3'$ in that case as a function of $\beta$.
Steps:
What distance, d, must separate Galileo and his assistant in order for the human reaction time, $\Delta t = 0.2$ s, to introduce no more than a $16\%$ error in the speed of light?
Electromagnetic wave 1 has a maximum electric field of $E_0=52\,\frac{\text V}{\text m}$, and electromagnetic wave 2 has a maximum magnetic field of $B_0=1.5\,\mu$T… Calculate the intensity of each wave.
Each pulse produced by an argon-fluoride excimer laser used in PRK and LASIK ophthalmic surgery lasts only 10.0 ns but delivers an energy of 2.50 mJ
What is the power produced during each pulse?
A helium-neon laser emits a beam of unpolarized light that passes through three Polaroid filters, as shown in the figure. (See Figure 1.) Suppose that filter 3 is at a general angle θ with the vertical.
plot 0.375 cos(theta-30 deg)^2 from 0 to 90 deg
1
in cell A1, 2
in cell A2 or B1, then select both cells and “drag” the corner of that block down or to the right=0.375*cos((A1-30)*PI()/180)^2