A carousel that is 6.00m in radius has a pair of 600Hz sirens mounted on posts at opposite ends of a diameter. The carousel rotates with an angular velocity of 0.900rad/s. A stationary listener is located at a distance from the carousel. The longest wavelength reaching the listener from the sirens is closest to

A carousel that is 6.00m in radius has a pair of 600Hz sirens mounted on posts at opposite ends of a diameter. The carousel rotates with an angular velocity of 0.900rad/s. A stationary listener is located at a distance from the carousel. The longest wavelength reaching the listener from the sirens is closest to

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter16: Electromagnetic Waves

Section: Chapter Questions

Problem 98AP: A radio station broadcasts its radio waves with a power of 50,000 W. What would be the intensity of...

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A microwave source produces pulses of 20.0-GHz radiation, with each pulse lasting 1.00 ns. A parabolic reflector with a face area of radius 6.00 cm is used to focus the micro-waves into a parallel beam of radiation as shown in Figure P24.72. The average power during each pulse is 25.0 kW. (a) What is the wavelength of these microwaves? (b) What is the total energy contained in each pulse? (c) Compute the average energy density inside each pulse. (d) Determine the amplitude of the electric and magnetic fields in these microwaves. (e) Assuming that this pulsed beam strikes an absorbing surface, compute the force exerted on the surface during the 1.00-ns duration of each pulse.
(a) The ideal size (most efficient) for a broadcast antenna with one end on the ground is onefourth the wavelength (/4) of the electromagnetic radiation being sent out. If a new radio station has such an antenna that is 50.0 m high, what frequency does it broadcast most efficiently? Is this in the AM or FM band? (b) Discuss the analogy of the fundamental resonant mode of an air column closed at one end to the resonance of currents on an antenna that is one-fourth their wavelength.
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?
Problem 1. A geostationary satellite is located 36,000 kilo- meters (km) away from the surface of the Earth. Once a minute it takes a digital picture and transmits the data to a base station on Earth. The rate of transmission is 10 Mbps and the propogation speed is 3.0 × 108 m/s. You may assume the actual time required to take the picture is negligible. a. What is the propagation delay of the link? b. The bandwidth-delay product is defined to be Rxdprop where dprop is the propagation delay. Calculate the bandwidth-delay product Rxdprop where deprop is the propagation delay. c. Let x denote the size of the picture in bits. What is the minimum value for x so that the satellite is continuously transmitting data over the link?
If two light rays one has wavelength A = 680 nm and the other one has wavelength опе 2=530 nm. 6. a) Which light rays travels a smaller distance in 1 second? Explain. b) Which light rays has the smaller frequency? Explain.
The distant galaxy called Cygnus A is one of the strongestsources of radio waves reaching Earth. The distance of thisgalaxy from Earth is 3 × 1024 m. How long (in years) doesit take a radio wave of wavelength 10 m to reach Earth?What is the frequency of this radio wave?
. The carrier wave is represent by equation c(t) 10Sinwct Draw the waveform for Am wave if m=D0.85
answer is D, explain how?
f the longth an gfen þepe Then the fecegueney of feth alalond 33,3 cm, Vsunt 333 m. 3000HZ (b 250042 © Icoo Hz 0 1250 12
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Noah Formula lives near the airport and frequently notices poor AM radio reception occurring as planes use the approach path which passes over his home. Having just finished the unit on light wave behavior, Noah now understands that the reception problem occurs because of radio wave signals reflecting off the planes and destructively interfering with waves which approach his antenna directly from the station. Noah’s favorite station – WFIZ – broadcasts at 1240 kHz and is located several miles from his home. Determine the five lowest heights above his home for which reflection off of planes will lead to destructive interference of this 1240 kHz signal. (Assume that the reflected waves do not undergo a phase change upon reflection off the plane.)