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25.3 Applications of
* EST Radar antenna height Why do you need to raise a radar emission antenna above the ground to be able to detect objects near the surface of Earth at the farthest range of the radar? Support your answer with a sketch Estimate how high you need to raise the radar with a pulse width of
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Chapter 25 Solutions
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- Revie Part A A sun-like star is barely visible to naked-eye observers on earth when it is a distance of 16 7.0 light years, or 6.6 x 104º m, away. The sun emits a power of 3.8 x 10 W. 26 Using this information, at what distance would a candle that emits a power of 0.38 W just be visible? Express your answer with the appropriate units. HA Ad = Value Units %3D Submit Request Answerarrow_forwardA powerful AM radio station that has a peak output power of 115 kW emits energy upward and outward but not downward so that it radiates uniformly across a hemispherical region as shown in the figure. Wave fronts Antenna What is the maximum electric field amplitude of a signal that is received 87 km from the station? Emax N/Carrow_forwardExample_8 The filament in a clear incandescent light bulb radiates visible light at a power of 5.00 W. Model the glass part of the bulb as a sphere of radius r = 3.00 cm and calculate the amount of electromagnetic energy from visible light inside the bulb. I= P_CEE² = A 2 I= cB 240 u(x, t) = µ£ + uß = ¹⁄€ E² +21 B². 240arrow_forward
- I Review I Constants I Periodic Table A radio antenna broadcasts a 1.0 MHz radio wave with 20 kW of power. Assume that the radiation is emitted uniformly in all directions. Part A What is the wave's intensity 35 km from the antenna? Express your answer in watts per meter squared.arrow_forwardI Review | Constants A 10-cm-diameter parallel-plate capacitor has a 1.0 mm spacing. The electric field between the plates is increasing at the rate 9.0x105 V/m s. Part A You may want to review (Pages 884 - 886). What is the magnetic field strength on the axis? Express your answer to two significant figures and include the appropriate units. HÀ B = Value Units Submit Request Answer Part B What is the magnetic field strength 3.5 cm from the axis? Express your answer to two significant figures and include the appropriate units. HÁ ? B = Value Units Submit Request Answer • Part C What is the magnetic field strength 6.7 cm from the axis? Express your answer to two significant figures and include the appropriate units. ? B = Value Units Submit Request Answerarrow_forwardPart A A 50 mW laser beam is polarized horizontally. It then passes through two polarizers. The axis of the first polarizer is oriented at 30° from the horizontal, and that of the second is oriented at 60° from the What is the power of the transmitted beam? horizontal. Express your answer with the appropriate units. ? P = Value Units Submit Request Answer Provide Feedbackarrow_forward
- Tmax Amin = 380nm = 380x1 & min=- M 1 max: 700hm - 700x 10-9. f max= 300×10= 1.895 3x108 = 4.286x Amin 700x10 V=N 1 Frequency range: 4.286 x 1014 -7.895x1014 f = * 듯 3. One type of radar works by sending a pulse out to and object and timing how long it takes for the pulse to return after bouncing off of the object. If the radar is tracking a plane 100 km away, how long does it take from the time the pulse leaves the radar to the time it returns? 16X374 + 3.33x10 4. Radar antenna tend to be of comparable size to their wavelength. The radiation used by radar ranges from 300 Mhz to 15 Ghz. a. What is the range of wavelengths? b. If the antenna dimensions are comparable to the wavelength of the radiation used, what will be the approximate size range of antenna used for radar? 3 =arrow_forwardQ3) what is the dispersion taking place in long transmission lines? State the condition to obtain dispersion-less transmission line. Verify your answer analytically.arrow_forwardQuestion 10 A group of students conduct a lab simulation to compare and contrast characteristics of electromagnetic and mechanical waves. The teacher instructed them to make a list of questions to present to their classmates about the similarities and differences they observe. Which question would be included in the students' list? A When were electromagnetic waves first discovered? B Does data travel by mechanical waves or electromagnetic waves? C Do both mechanical and electromagnetic waves need a medium to travel through? D Can mechanical waves and electromagnetic waves both be illustrated on a graph?arrow_forward
- In an EM wave traveling west, the B field oscillates up and down vertically and has a frequency of 89.0 kHz and an rms strength of 7.25 x 10 9 T. Assume that the wave travels in free space. What is the frequency of the electric field? Express your answer to three significant figures and include the appropriate units HẢ ? f = Value Units Submit Request Answer Part B What is the rms strength of the electric field? Express your answer to three significant figures and include the appropriate units HA ? Erms = Value Units Submit Request Answer Part C What is the direction of its oscillation? O The electric field oscillates along the horizontal north-south line. O The electric field oscillates along the horizontal west-east line. O The electric field oscillates vertically. O None of the above.arrow_forwardI Review Laboratory scientists have created the electric and magnetic fields shown in (Figure 1). These fields are also seen by scientists that zoom past in a rocket traveling in the x-direction at 1.0 x 106 m/s. Assume that B = 0.52 T and E = 1.2x106 V/m. Part A According to the rocket scientists, what angle does the electric field make with the axis of the rocket? Express your answer in degrees. ? ° above the axis of the rocket Figure 1 of 1> Submit Request Answer 1.0 X 10 m/s Provide Feedback Next > 458arrow_forwardAbout Maxwell's displacement current, judge the following items. I. It is obtained from the variation of the magnetic flux, for example, between the plates of a capacitor. II. The displacement current establishes a symmetry between the electric and magnetic fields by indicating that, just as the temporal variations of the magnetic field produce an electric field (Faraday's Law), it is possible that magnetic fields are created from temporal variations of the electric field . III. The displacement current was fundamental to the understanding that light is an electromagnetic wave. IV. Ampere's Law works independently of the existence of the Maxwell displacement current, as long as we consider only stationary electrical currents. Choose an option:A. II, III and IV correct.B. II and III correct.C. I, II and III correct.D. I, II and IV correct.E. I and IV correct.F. Only II is correct.G. All incorrect.H. Only III is correct.arrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage LearningPrinciples of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
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