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)
- What is the average magnitude of the Poynting vector 5.00 mi from a radio transmitter broadcasting isotropically (equally in all directions) with an average power of 250 kW?arrow_forwardFigure P24.13 shows a plane electromagnetic sinusoidal wave propagating in the x direction. Suppose the wavelength is 50.0 m and the electric field vibrates in the xy plane with an amplitude of 22.0 V/m. Calculate (a) the frequency of the wave and (b) the magnetic field B when the electric field has its maximum value in the negative y direction. (c) Write an expression for B with the correct unit vector, with numerical values for Bmax, k, and , and with its magnitude in the form B=Bmaxcos(kxt) Figure P24.13 Problems 13 and 64.arrow_forwardThe 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_forward
- An electromagnetic wave with frequency 4.00 *10^14 Hz travels through vacuum in the positive direction of an x axis. The wave has its electric field oscillating parallel to the y axis, with an amplitude Em.At time t= 0, the electric field at point P on the x axis has a value of +Em/4 and is decreasing with time. What is the distance along the x axis from point P to the first point with E = 0 if we search in (a) the negative direction and (b) the positive direction of the x axis?arrow_forwardAssume the mostly infrared radiation from a heat lamp acts like a continuous wave with wavelength 1.50 µm. (a) If the lamp’s 200-W output is focused on a person’s shoulder, over a circular area 25.0 cm in diameter, what is the intensity in W/m2? (b) What is the peak electric field strength? (c) Find the peak magnetic field strength. (d) How long will it take to increase the temperature of the 4.00-kg shoulder by 2.00º C , assuming no other heat transfer and given that its specific heat is 3.47×103 J/kg⋅ºC?arrow_forwardAssume the mostly infrared radiation from a heat lamp acts like a continuous wave with wavelength 1.50 µm . (a) If the lamp’s 200-W output is focused on a person’s shoulder, over a circular area 25.0 cm in diameter, what is the intensity in W/m2 ? (b) What is the peak electric field strength? (c) Find the peak magnetic field strength. (d) How long will it take to increase the temperature of the 4.00-kg shoulder by 2.00º C , assuming no other heat transfer and given that its specific heat is 3.47×103 J/kg ⋅ ºC ?arrow_forward
- Remember the wave equation is y = lambda For electromagnetic waves traveling in a vacuum, they all travel at the speed of light =c=2.998*10^ 8 s/m. A water wave (a mechanical wave, not an electromagnetic wave!) has a frequency of 20 Hz and a wavelength of 0.1 m. Calculate the speed of this wave. 1/2 * m / s; 6m / s; 3m / s; 2m / s 4 m / sarrow_forwardA space probe 2.0 * 1010 m from a star measures the total intensity of electromagnetic radiation from the star to be 5.0 * 103 W/m2. If the star radiates uniformly in all directions, what is its total average power output?arrow_forwardWhat is the intensity in W/m2 of a laser beam used to burn away cancerous tissue that puts 374 J of energy into a circular spot 2.00 mm in diameter in 4.67 s? Compare this to the average intensity of sunlight (about 700 W/m2). answer blank times 10^7arrow_forward
- A rescuer in an all-terrain vehicle (ATV) is tracking two injured hikers in the desert, each of whom has an emergency locator transmitter (ELT) stored in his backpack. The beacons give off radio signals at 121.5 MHz, in phase, and there is a receiver in the ATV that is tuned to that frequency. The speed of the radio waves is 3.00×108 m/s. The ATV is traveling due east, 2.00×102 m north of the hikers, and the hikers are 1.00×102 m apart. What is the spacing between the points at which the driver detects constructive interference between the two signals?arrow_forward• What is the rms value of the electric field in a sinusoidal electromagnetic wave that has a maximum electric field of 99 V>m?arrow_forward
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