25.1 and 25.2 Polarization of waves and Discovery of
* The current in an antenna is oscillating with a period
Using the same coordinate system, draw (a) two graphs that show how the
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- You are a coach for the Physics Olympics team participating in a competition overseas. You are given the following sample problem to present to your team of students, which you need to solve very quickly: A person is standing on the midline of a soccer field. At one end of the field, as shown in Figure P24.28, is a letter D, consisting of a semicircular metallic ring of radius R and a long straight metal rod of length 2R, the diameter of the ring. The plane of the ring is perpendicular to the ground and perpendicular to the midline of the field shown by the broken line in Figure P24.28. Because of an approaching lightning storm, the semicircular ring and the rod become charged. The ring and the rod each attain a charge Q. What is the electric potential at point P, which is at a position x along the midline of the field, measured from the center of the rod, due to the letter D? Think quickly and use all resources available to you, which include your physics textbook: yon are in competition! Figure P24.28arrow_forwardLasers can be constructed that produce an extremely high intensity electromagnetic wave for a brief time-called pulsed lasers. They are used to ignite nuclear fusion, for example. Such a lager may produce an electromagnetic wave with a maximum electric field strength of 1.001011V/m for a time of 1.00 ns. (a) What is the maximum magnetic field strength in the wave? (b) What is the intensity of the beam? (c) What energy does it deliver on a 1.00-mm2 area?arrow_forwardCertain sunglasses use a polarizing material to reduce the intensity of light reflected as glare front water or automobile windshields. What orientation should the polarizing filters haw to be most effective? (a) The polarizers should absorb light with its electric field horizontal. (b) The polarizers should absorb light with its electric field vertical. (c) The polarizers should absorb both horizontal and vertical electric fields. (d) The polarizers should not absorb either horizontal or vertical electric fields.arrow_forward
- The distance to the North Star, Polaris, is approximately 6.44 1018 m. (a) If Polaris were to burn out today, how many years from now would we see it disappear? (b) What time interval is required for sunlight to reach the Earth? (c) What time interval is required for a microwave signal to travel from the Earth to the Moon and back?arrow_forwardQuestion 3Radio waves, a type of electromagnetic wave, are emitted by an antenna, picked up by a receiver, and translated into sound waves. Electrons in the antenna oscillate creating the radio waves, and these oscillations are decoded by the receiver to create sound waves in the range of human hearing. This concept is similar to having two aluminum cans connected by a string and sound is transmitted as vibrations in the string.Which statement describes a similarity shared between electromagnetic and mechanical waves?A Electromagnetic and mechanical waves are both transverse waves. B Electromagnetic and mechanical waves are both caused by vibrations. C Electromagnetic and mechanical waves both need a medium to travel through. D Electromagnetic and mechanical waves both travel fastest through high density mediums such as solids.arrow_forwardQuestion 10 Police radar speed guns basically work by reflecting electromagnetic waves off the car's surface. Suppose you want to drive real fast on the motorway and somehow you have tracked exactly the frequency of police speed radar. The frequency of the police speed radar is f 1238 Hz. Find its wavelength. Hint c = 3 x 10% No need to include the unit. Write your answer in whole numbers. Round your answer to 0 decimal places.arrow_forward
- Question 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_forwardIn the Michelson-Morley experiment of 1887, the speed at which light traveled through vacuum in perpendicular directions was measured to high accuracy. The data indicated that light traveled at exactly the same speed, independent of which direction it traveled. From this data, scientists concluded that: Select one: a.the speed that light travels through vacuum depends on the speed of the source of light b.light behaves like a stream of particles c.light can eject electrons from a metal surface d.light does not require a medium - it may travel through vacuumarrow_forward1) Electric fields can be sources of magnetic fields. When does this happen? a. When the electric field is static b. The answer cannot be found on the other choices c.When the electric field is static and the charge in the said electric field is moving with uniform velocity d.When the electric field is static and the charge in the said electric field is moving with constant acceleration 2) Consider a hemisphere present in a uniform magnetic field. Which of the following is true? a.The magnetic flux coming in the dome travels from infinity, coming from the other half of the hemisphere. b.The amount of magnetic flux passing through the dome is also the amount of the magnetic flux passing through its circular base c.The magnetic flux coming out of the dome extends indefinitely to infinity, seeking the other half of the hemisphere d.More information is needed to determine the behavior of the magnetic flux in the given scenarioarrow_forward
- Following is the explanation of Maxwell's Equations: A. B. C. D. Maxwell's equations represent one of the most elegant and concise ways to state the fundamentals of electricity and magnetic. Maxwell's equations are a set of 4 complicated equations that describe the world of electromagnetics. Maxwell's equations in understanding the creation of electric and magnetic fields from electric charges and current. All of the above.arrow_forwardRail Gun 17 of 23 I Review | Constants | Periodic Table Part A A rail gun uses electromagnetic forces to accelerate a projectile to very high velocities. The basic mechanism of acceleration is relatively simple and can be illustrated in the following example. A metal rod of mass 10.0 g and electrical resistance 0.100 N rests on parallel horizontal rails that have negligible electric resistance. The rails are a distance L = 8.00 cm apart. (Figure 1)The rails are also connected to a voltage source providing a voltage of V = 5.00 V . Find us, the coefficient of static friction between the rod and the rails. Give your answer numerically. • View Available Hint(s) The rod is placed in a vertical magnetic field. The rod begins to slide when the field reaches the value B = 1.23x10-2 T . Assume that the rod has a slightly flattened bottom so that it slides instead of rolling. Use 9.80 m/s² ΑΣΦ ? for the magnitude of the acceleration due to gravity. Submit Request Answer Provide Feedback Next >…arrow_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
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