(a) The ideal size (most efficient) for a broadcast antenna with one end on the ground is one−fourth the wavelength (λ/4) of the
Want to see the full answer?
Check out a sample textbook solutionChapter 24 Solutions
College Physics
Additional Science Textbook Solutions
College Physics: A Strategic Approach (4th Edition)
Lecture- Tutorials for Introductory Astronomy
Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)
Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)
Conceptual Physics (12th Edition)
Physics: Principles with Applications
- What is the average magnitude of the Poynting vector 5.00 mi from a radio transmitter broadcasting isotropically (equally in all directions) with an average power of 250 kW?arrow_forwardA 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?arrow_forwardConsider electromagnetic waves propagating in air. (a) Determine the frequency of a wave with a wavelength of (i) 5.0 km, (ii) 5.0 µm, (iii) 5.0 nm. (b) What is the wavelength (in meters and nanometers) of (i) gamma rays of frequency 6.50 x 1021 Hz and (ii) an AM station radio wave of frequency 590 kHz?arrow_forward
- The GPS networkconsists of 24 satellites, each of which makes two orbits around the earthper day. Each satellite transmits a 50.0 W (or even less) sinusoidal electromagneticsignal at two frequencies, one of which is 1575.42 MHz.Assume that a satellite transmits half of its power at each frequency andthat the waves travel uniformly in a downward hemisphere. If the receiver is a square panel 1.50 cm on a side that absorbs all of the beam, what average pressure does the signal exert on it?arrow_forwardHomework: The radiated power density of an antenna is given by by A, (sine)² W ār r² m² W rad = Determine: 1- Prad 2- U(0, 0) 3- Doarrow_forward(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 FortCollins, Colorado.arrow_forward
- Project Seafarer was an ambitious program to construct an enormous antenna, buried underground on a site about 10000 km2 in area. Its purpose was to transmit signals to submarines while they were deeply submerged. If the effective wavelength were 4.6 × 104 Earth radii, what would be the (a) frequency and (b) period of the radiation emitted? Ordinarily, electromagnetic radiations do not penetrate very far into conductors such as seawater. Take the Earth's radius to be 6370 km.arrow_forwardA 'dispersion relation' relates frequency and wavelength of a harmonic wave. That is, the wavelength of the wave due to a change in its frequency. For electromagnetic waves (e.g. light), the dispersion relation is k : where n is the refractive index. Consider two C harmonic electromagnetic waves of equal amplitude travelling in the same direction in vacuum with wavelengths, 500nm and 505nm. a) Consider if both waves now travel through a material with index, n=1.5. Their frequency remains the same but their wavelength changes due to the new material. Calculate the beat frequency, beat wavenumber (i.e. k), carrier frequency, and carrier wavenumber. b) With the numbers in a), calculate the velocity of the envelope and the velocity of the carrier. c) Consider now if the index varies with the vacuum wavelength, n(500nmn)=1.5214 and n(505nm)=1.5211. (frequency never changes when entering a material). What is the velocity of the carrier and envelope in this case?arrow_forwardThe GPS networkconsists of 24 satellites, each of which makes two orbits around the earthper day. Each satellite transmits a 50.0 W (or even less) sinusoidal electromagneticsignal at two frequencies, one of which is 1575.42 MHz.Assume that a satellite transmits half of its power at each frequency andthat the waves travel uniformly in a downward hemisphere. What wavelength must the receiver be tuned to?arrow_forward
- The GPS networkconsists of 24 satellites, each of which makes two orbits around the earthper day. Each satellite transmits a 50.0 W (or even less) sinusoidal electromagneticsignal at two frequencies, one of which is 1575.42 MHz.Assume that a satellite transmits half of its power at each frequency andthat the waves travel uniformly in a downward hemisphere. What average intensity does a GPS receiver on the ground, directly below the satellite, receive? (arrow_forwardA television is tuned to a station broadcasting at a frequency of2.04 * 108Hz. For best reception, the rabbit-ear antenna used bythe TV should be adjusted to have a tip-to-tip length equal to halfa wavelength of the broadcast signal. Find the optimum length ofthe antennaarrow_forwardA 75-kW radio station broadcasts its signal uniformly in all directions. (a) What is the average intensity of its signal at a distance of 250 m from the antenna? (b) What is the average intensity of itssignal at a distance of 2500 m from the antenna?arrow_forward
- Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPhysics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning
- Physics for Scientists and Engineers, Technology ...PhysicsISBN:9781305116399Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningGlencoe Physics: Principles and Problems, Student...PhysicsISBN:9780078807213Author:Paul W. ZitzewitzPublisher:Glencoe/McGraw-Hill