College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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A radio station utilizes frequencies between commercial AM and FM. What is the frequency of a 11.12-m-wavelength channel?
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- In North America, broadcast channels are numbered 2 through 69, and each has an associated frequency range. What are the wavelength ranges for the following? (a) the VHF channel 2 (54-60 MHz) m (maximum wavelength) m (minimum wavelength) (b) the VHF channel 11 (198-204 MHz) m (maximum wavelength) m (minimum wavelength)arrow_forwardVHF, or very high frequency, refers to radio frequency electromagnetic waves in the range 30 to 300 MHz. In the U.S., television stations broadcast channels 2 through 13 in the VHF range between 54.0 MHz and 216 MHz, with ranges 72.0 to 76.0 MHz and 88.0 to 174 MHz not utilized for TV broadcasting. Each channel has a frequency width of 6.00 MHz. The table below gives the lower and upper frequency of each channel. Channel Lower edge (MHz) Upper edge (MHz) 2 54 60 3 60 66 4 66 72 5 76 82 6 82 82 88 7 174 180 8 180 186 9 186 192 10 192 198 11 198 204 12 204 210 13 210 216 (a) Calculate the broadcast wavelength range for channel 2. (Enter your answers from smallest to largest, in m.) smallest value m largest value m (b) Calculate the broadcast wavelength range for channel 4. (Enter your answers from smallest to largest, in m.) smallest value largest value m m (c) Calculate the broadcast wavelength range for channel 6. (Enter your answers from smallest to largest, in m.) smallest value…arrow_forwardProblem 16: Two microwave frequencies are authorized for use in microwave ovens: 900 and 2560 MHz. Part (a) Calculate the wavelength, in centimeters, of the 900-MHz microwave. λ1 = _____ Part (b) Calculate the wavelength, in centimeters, of the 2560-MHz microwave. λ2 = ______arrow_forward
- What is the radiation pressure 1.2 m away from a 600 W lightbulb? Assume that the surface on which the pressure is exerted faces the bulb and is perfectly absorbing and that the bulb radiates uniformly in all directions. Number Units Use correct number of significant digits; the tolerance is +/-1 in the 2nd significant digitarrow_forward. Starting in 2009, TV stations in the U.S. switched to digitalsignals. To watch today’s digital broadcast TV, could you use a pre-2009 TV antenna meant for analog? Explain.(a) No; analog antennas do not receive digital signals.(b) No; digital signals are broadcast at differentfrequencies, so you need a different antenna.(c) Yes; digital signals are broadcast with the same carrierfrequencies, so your old antenna will be fine.(d) No; you cannot receive digital signals through anantenna and need to switch to cable or satellite.arrow_forwardWhat is the frequency of the microwaves in a microwave oven? The wavelength is 4.00 cm. GHzarrow_forward
- an AM station operating at a frequency of 750 kHz. what is m?arrow_forwardA microwave source produces pulses of 21.0 GHz radiation, with each pulse lasting 1.00 ns. A parabolic reflector with a face area of radius R = 8.50 cm is used to focus the microwaves into a parallel beam of radiation, as shown in the figure below. The average power during each pulse is 25.0 kW. (a) What is the wavelength of these microwaves? cm (b) What is the total energy contained in each pulse? μJ (c) Compute the average energy density inside each pulse. mJ/m³ 3 (d) Determine the amplitude of the electric field and magnetic field in these microwaves. Emax kv/m μT B. max (e) Compute the force exerted on the surface during the 1.00 ns duration of each pulse. Assume this pulsed beam strikes an absorbing surface. UNarrow_forwardIn a particular city, electrical energy costs $0.13 per kilowatt-hour. (Round your answers, in dollars, to at least two decimal places.) (a) How much does it cost to operate an old-style incandescent 60.0-W light bulb continuously for 24 hours? $ ??? (b) A modern LED light bulb that emits as much visible light as a 60.0-W incandescent only draws 8.50 W of power. How much does it cost to operate this bulb for 24 hours? $ ??? (c) A particular electric oven requires a potential difference of 220 V and draws 20.0 A of current when operating. How much does it cost to operate the oven for 4.30 hours? $ ???arrow_forward
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