A communications truck with a 44-cm-diameter dish receiver on the roof starts out
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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)
- The electric field of an electromagnetic wave traveling in vacuum is described by the following wave function: E =(5.00V/m)cos[kx(6.00109s1)t+0.40] j where k is the wavenumber in rad/m, x is in m, t s in Find the following quantities: (a) amplitude (b) frequency (c) wavelength (d) the direction of the travel of the wave (e) the associated magnetic field wavearrow_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_forwardSuppose the magnetic field of an electromagnetic wave is given by B = (1.5 1010) sin (kx t) T. a. What is the maximum energy density of the magnetic field of this wave? b. What is maximum energy density of the electric field?arrow_forward
- What is the intensity of an electromagnetic wave with a peak electric field strength of 125 Vim?arrow_forwardThe light at the Earth from a certain star has an intensity of about 76×10-8W/m2. If the star emits radiation with the same power as our Sun, how far away is it from Earth? NOTE: Use 1000 W/m^2 as the intensity of the Sun at the Earth!arrow_forwardSatellite TV is broadcast from satellites that orbit the earth. Their antennas broadcast a 15 kW microwave signal that covers most of North America, an area of about 2.5 × 107 km2. What is the total power that strikes a 46-cm-diameter ground-based dish antenna?arrow_forward
- A small spaceship cruises the solar system using an ideal, square-absorbing solar sail with side length L = 1000 m. a.Assume the sun can be modeled as a point source of light. If the intensity of electromagnetic radiation near the earth is 1300 W/m2, and the earth is 150°x10^9m from the sun, what is the power of the sun’s light emission? If this spacecraft is close to Mars, 230°x10^9m away from the sun, and is traveling directly away from the sun with an acceleration a0 = 0.01m/s2 what is the mass of the spacecraft? b. You fasten two adjustable light polarizers with polarizer axes that subtend an angle θ with respect to one another on the side of the sail where light is incident. These polarizers are the same size as the sail, covering its total area. What must θ be to reduce the acceleration of the craft to a0/8? What must θ be to reduce the acceleration of the craft to 0? c.Using the value of θ you found that corresponds to the acceleration of a0/8 find the the magnitude of the…arrow_forwardRadio waves and microwaves are used in therapy to provide “deep heating” of tissue because the waves penetrate beneath the surface of the body and deposit energy. We define the penetration depth as the depth at which the wave intensity has decreased to 37% of its value at the surface. The penetration depth is 15 cm for 27 MHz radio waves. For radio frequencies such as this, the penetration depth is proportional to √λ, the square root of the wavelength. If the frequency of the radio waves is increased, the depth of penetrationA. Increases. B. Does not change. C. Decreases.arrow_forwardOn a cloudless day, the sunlight that reaches the surface of the earth has an intensity of about 1.3 × 10³ W/m². What is the electromagnetic energy contained in 6.0 m³ of space just above the earth's surface?arrow_forward
- Electromagnetic radiation from a 4.9-mW laser is concentrated on a 0.75-mm2 area. Part (a) What is the intensity of the radiation falling on this surface, in watts per square meter? I = Part (b) Suppose the surface carries a 2.00-nC electric charge. What is the maximum magnitude of the electric force, in newtons, it experiences? FE,0 = Part (c) If the charge moves at 400 m/s, what is the maximum magnetic force, in newtons, that it feels? FB,0 =arrow_forwardRadio waves and microwaves are used in therapy to provide “deep heating” of tissue because the waves penetrate beneath the surface of the body and deposit energy. We define the penetration depth as the depth at which the wave intensity has decreased to 37% of its value at the surface. The penetration depth is 15 cm for 27 MHz radio waves. For radio frequencies such as this, the penetration depth is proportional to √λ, the square root of the wavelength. What is the wavelength of 27 MHz radio waves?A. 11 m B. 9.0 m C. 0.011 m D. 0.009 marrow_forwardOn its highest power setting, a certain microwave oven projects 1 kW of microwaves onto a 32 cm by 38 cm area. (a) What is the average intensity in Intensity: 822.37 W 2 m z? W 2 m (b) Calculate the peak electric field strength Ę in these waves. E248.83 V m (c) What is the peak magnetic field strength B? B 8.29×10: 1 No, that's not the correct answer.arrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage LearningPhysics for Scientists and Engineers, Technology ...PhysicsISBN:9781305116399Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning