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It is not completely understood what it is about APC ferrules that cause them to have less back reflection than UPC ferrules.
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- Radio station WWVB, operated by the National Institute of Standards and Technology (NIST) from Fort Collins, Colorado, at a low frequency of 60 kHz, broadcasts a time synchronization signal whose range covers the entire continental US. The timing of the synchronization signal is controlled by a set of atomic clocks to an accuracy of 101012 s, and repeats every 1 minute. The signal is used for devices, such as radio-controlled watches, that automatically synchronize with it at preset local times. WWVB's long wavelength signal tends to propagate close to the ground. (a) Calculate the wavelength of the radio waves from WWVB. (b) Estimate the error that the travel time of the signal causes in synchronizing a radio controlled watch in Norfolk, Virginia, which is 1570 mi (2527 km) from Fort Collins, Colorado.A radio station broadcasts its radio waves with a power of 50,000 W. What would be the intensity of this signal if it is received on a planet orbiting Proxima Centuri, the closest star to our Sun, at 4.243 ly away?What causes APC ferrules to have less back reflection than UPC ferrules is not well understood.
- Similar to perceived loudness in hearing, the brightness thehuman eye and brain perceive for light is logarithmic ratherthan linear. For example, you do not perceive light that has anintensity of S as being twice as bright as light of intensity S>2.What happens to the perceived brightness of a light bulb ifyou double the distance from it?. Given that a microwave works by setting up a standing wave inside the oven, explain why instructions for any microwavable food will always insist that you rotate your food at least once during cooking.A sun-like star is barely visible to naked-eye observers on earth when it is a distance of 7.0 light years, or 6.6 × 1016 m, away. The sun emits a power of 3.8 × 1026 W. Using this information, at what distance would a candle that emits a power of 0.20 W just be visible?
- A speeder tries to explain to the police that the yellow warning lights she was approaching on the side of the road looked green to her because of the Doppler shift. How fast would she have been traveling if yellow light of wavelength 576.6 nm had been shifted to green with a wavelength of 562.3 nm? Note: For speeds less than 0.03c, the equation below will lead to a value for the observed frequency accurate to approximately two significant digits. answer in m/sYou shout the word "hello!" into an idealized echo tube. Five seconds later, the "hello!" returns to your ears. Assuming the speed of sound is 340 m/s, how long is the echo tube? The echo is happening perfectly linearly, i.e. no bouncing off the sides of the tube. Just straight down and back again.What is the intensity in W/m2 of a laser beam used to burn away cancerous tissue that, when 94.0% absorbed, puts 540 J of energy into a circular spot 2.20 mm in diameter in 4.00 s? Discuss how this intensity compares to the average intensity of sunlight (about 700 W/m2) and the implications it would have if the laser beam entered your eye. Note how your answer depends on the time duration of the exposure.
