Would the headlights of a distant car form a two-source interference pattern? If so, how might it be observed? If not, why not?
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Would the headlights of a distant car form a two-source interference pattern? If so, how might it be observed? If not, why not?
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- A 3.14-kHz tone is being produced by a speaker with a diameter of 0.220 m. The air temperature changes from 0 to 29 °C. Assuming air to be an ideal gas, find the change in the diffraction angle 8. O 0₁ (colder) 0₂(hotter)(a) A possible means for making an airplane invisible to radar is to coat the plane with an antireflective polymer. If radar waves have a wavelength of 2.72 cm and the index of refraction of the polymer is n = 1.80, how thick (in cm) would you make the coating? (Assume that the index of refraction of the plane is higher than that of the coating. Also assume that the radar waves are normal to the surface of the coating. Give the minimum thickness that would make the airplane invisible to radar.) cm (b) What If? Newer radar systems now use the VHF and UHF bands in order to detect stealthy aircraft. If a radar system operates with a frequency of 441 MHz (in the UHF band), what minimum thickness of coating (in cm) is needed to render an aircraft invisible to this radar band? cm (c) Will an antireflective polymer coating make the airplane invisible to both the 2.72 cm X-band radiation in part (a) and the 441 MHz UHF-band radiation in part (b)? Yes, an antireflective polymer coating will…The 300-m-diameter Arecibo radio telescope detects radio waves with a 4.00 cm averagewavelength.(a) What is the angle between two just-resolvable pointsources for this telescope? (b) How close together could these point sources be at the 2million light year distance of the Andromeda galaxy?
- Waves from a radio station have a wavelength of 250 m. They travel by two paths to a home receiver 20.0 km from the transmitter. One path is a direct path, and the second is by reflection from a mountain directly behind the home receiver. What is the minimum distance from the mountain to the receiver that produces destructive interference at the receiver? (Assume that no phase change occurs on reflection from the mountain.)An interference filter has a dielectric layer (refractive index 1.34) with a thickness of 0.805 μm. If the determination is to be based on the first-order interference, calculate the wavelength (nm) can be transmitted?Consider two identical antennas separated by 9.00 m that radiate in phase at 120 MHz. A receiver placed 150 m from both antennas measures an intensity Io. The receiver is moved so that it is 1.8 m closer to one antenna than to the other.
- ThanksYou have decided to increase the detection range of your iphone14 with a highgain, directional parabolic dish antenna to be able to access more distant cell towers (somewhat more difficult to get into your pocket or purse, however). A 3m-diameter parabolic dish is readily available commercially, and the desired sinusoidal radio signal specification is for Emax = 0.10 µV/m. Assume the antenna absorbs all the radiation that is captured by the dish (100% efficiency): (a) What is the amplitude of the magnetic field in this signal? (b) What is the intensity, I, of the radiation received by the antenna? (c) What is the power received by the antenna?Two identical sources A and B emit in-phase plane radio waves with frequency 7.84E4 Hz and intensity 1.78E2 W/m2. A detector placed at location P closer to source B than source A detects a destructive interference. What is the intensity of the wave detected by the detector (in W/m2)?