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  1. J

    Muon decay and Special Relativity

    Homework Statement Cosmic muons are produced when protons in cosmic rays hit the atmosphere about 10km above us. How fast do muons have to travel in order to reach the Earth before decaying if they live 2.2μs before decaying? Consider the analysis for the rest frame of a) the Earth and b) the...
  2. J

    Michaelson Interferometer and changing length of glass rod

    Homework Statement The index of refraction of a glass rod is 1.48 at T=20°C and varies linearly with temperature, with a coefficient of 2.5 E -5 °C-1. The coefficient of linear expansion of the glass is 5 E -6 °C-1. At 20.0°C the length of the rod is 3.00 cm. A Michelson interferometer has...
  3. J

    Maximum Intensity Between Dark Fringes, Diffraction

    Ah yes. Radians. That was the issue. That always seems the case. Radians is a reoccuring enemy of mine. Thanks.
  4. J

    Maximum Intensity Between Dark Fringes, Diffraction

    Homework Statement Laser light of wavelength 632.8 nm falls normally on a slit that is 0.0210 mm wide. The transmitted light is viewed on a distant screen where the intensity at the center of the central bright fringe is 8.50 W/m2. a) Find the maximum number of totally dark fringes on the...
  5. J

    Angular Acceleration due to Light Waves

    I found the correct answer (1.46x10-13) after a bit of trouble (I was calculating Intensity wrong, haha...). I'm going to post a quick run through of my work so that anyone who invariably stumbles upon this problem might see it worked out neatly. Intensity = Emax2/2μoc = .001754 Prad total is...
  6. J

    Angular Acceleration due to Light Waves

    Alright, so the force on the black square would be (Area)(Intensity)/c and the force on the reflecting square would be twice that. As I mentioned earlier, the apparent (if that is the right word) force would be I/c on the right block. Torque (τ) is Fd and α is τ/Inertia. Plugging in all I...
  7. J

    Angular Acceleration due to Light Waves

    Homework Statement Two square reflectors, each 1.00 cm on a side and of mass 4.00 g, are located at opposite ends of a thin, extremely light, 1.00-m rod that can rotate without friction and in a vacuum about an axle perpendicular to it through its center (the figure ). These reflectors are...
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