solve AND explain each step It is often desirable to radiate most of the energy from a radiotransmitter in particular directions rather than uniformly in alldirections. Pairs or rows of antennas are often used to produce thedesired radiation pattern. As an example, consider two identicalvertical antennas 400 m apart, operating at 1500 kHz (near the topend of the AM broadcast band) and oscillating in phase.a) At distances much greater than 400 m in what directions is theintensity from the two antennas greatest?b) Repeat the solution for antenna distance of 600 m.

a) λ=fv=1500×1033×108=200mdsinθ=λ400sinθ = 200θ = sin−1(400200)θ = 30°the directions is the…

Answered: It is often desirable to radiate most…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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An interference filter is to be constructed for isolation of the nitrobenzene absorption band at 1537cm-1. a) If it is to be based on first-order interference, what should be the thickness of the dielectric layer(refractive index of 1.34)? b) What other wavelength would be transmitted?
In an aircraft, to protect a PCB from external interference signals it is housed in an Aluminum(Al) Box (this is normally referred to as shielding). Conductivity of Al is 38.2 x 106 S/m & µr = 1. What shall be the minimum thickness of the Al sheet from which this box is made, if we have to block 1.6 MHz interference signal from passing through this sheet?
S1 and S2 in the figure below are effective point sources of radiation, excited by the same oscillator. They are coherent and in phase with eachother. Placed a distance d=4.17m apart, they emit equal amounts of power in the form of 1.06m wavelength electromagnetic waves. (a) Find the positions of the first, second, and third maxima of the received signal, as the detector D is moved along the x axis starting at 0. (b) Write an equation that you could use to find the location of any minima and find the position of at least one minimum on the x axis.
A spherical black body of radius r at absolute temperature T is surrounded by a thin spherical and concentric shell of radius R, black on both sides. Show that the factor by which this radiation shield reduces the rate of the cooling body is given by the following expression: aR^2/(R^2+br^2), and find the numerical coefficients and a and b.
Let's consider the sun to act like an ideal thermal radiator at a temperature of 6000 K. (a) At what wavelength does the sun emit its peak intensity? In what part of the electromagnetic spectrum does this wavelength reside? Comment on how this wavelength compares with the peak sensitivity of the human eye. (You may need to look this up somewhere.) (b) Consider an interval of width d) = 2.0 nm centered on the wavelength you found in part (a). What is the intensity of the solar radiation emitted within this range? (Hint: You can use the approach of Example 3.6 on page 87 of our textbook. (c) What fraction of the total solar radiation does this represent?
2.37. A 300 MHz uniform plane wave, traveling along the x-axis in the negative x-direction, whose electric field is given by E, = E,(jâ, + 3â¸)e*jkx where E, is a real constant, impinges upon a dipole antenna that is placed at the origin and whose electric field radiated toward the x-axis in the positive x-direction is given by E. = E,(â, + 2â,)e¬jke where E, is a real constant. Determine the following: (a) Polarization of the incident wave (including axial ratio and sense of rotation, if any). You must justify (state why?). (b) Polarization of the antenna (including axial ratio and sense of rotation, if any). You must justify (state why?). (c) Polarization loss factor (dimensionless and in dB). Incident Wave Antenna
(a) What would a small T.V. antenna suggest about the broadcast signal it is designed to receive?(b) A radio station in Sydney broadcasts at 9.67 MHz. What would be the length of its antenna if this is exactly half a wavelength long?
1:.0 O %).. N O a all zain 1Q O 24 May 2021 a... H.W: If a (10 mJ) laser pointer creates a spot that is 5 mm in diameter in a 30 second, determine the radiation pressure on a screen that absorbs 40% of the light that strikes it.
Oxygenated hemoglobin absorbs weakly in the red (hence its red color) and strongly in the near infrared, whereas deoxygenated hemoglobin has the opposite absorption. This fact is used in a “pulse oximeter” to measure oxygen saturation in arterial blood. The device clips onto a person’s finger and has two light emitting diodes (i.e., LEDs) – a red (660nm) and an infrared (940nm) – and a photocell that detects the amount of light transmitted through the finger at each wavelength a)Determine the frequency of each of these light sources. b)If the intensity of the beams is 1.00X10-6 Watts/m2 , calculate the peak electric and magnetic fields of the light supplied by the LEDs.
S1 and S2 in the figure below are effective point sources of radiation, excited by the same oscillator. They are coherent and in phase with eachother. Placed a distance d=4.17m apart, they emit equal amounts of power in the form of 1.06m wavelength electromagnetic waves. (PHYS 1801 CL06) (a) Find the positions of the first, second, and third maxima of the received signal, as the detector D is moved along the x axis starting at 0. (b) Write an equation that you could use to find the location of any minima and find the position of at least one minimum on the x axis. y S2 d D x- 's ]o
Two spherical stars A and B emit blackbody radiation. The radius of A is 400 times that of B and A emits 10 times the power emitted from B. The ratio (2A/2B) of their wavelengths A and B at which the peaks occur in their respective radiation curves is
7.1.5. In the 25-ft Space Simulator facility at NASA's Jet Propul- sion Laboratory, a bank: of overhead arc lamps can produce light of intensity 2500 W/m² at the floor of the facility. (This simulates the intensity of sunlight near the Venus.) Find the average radiation pres- sure on (a) a totally absorbing section of the floor, and (b) a totally reflecting section of the floor.ig

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