a What is the amplitude of the electric field of the signal at the observer, E,? b. What is the amplitude of the magnetic field of the signal at the observer, B_? c If the transmitter emits radio waves isotropically, what is the average transmitter power, P?
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- S. A source of electromagnetc waves radiates power uniformly in all directions at a single frequency. At a distance of 3.50 km from the source, a detector measures the intensity of the wave to be 28.0 AW/m². 4) What is the peak value of the magnetic field at the detector due to the waye? b) What is the average power radiated by the source? c) Now the detector is replaced with a perfectly absorbing shee nomal to the incident dux, with surface area 1.50 m". What is the force on the sheet due to the wave?A typical helium-neon laser found in supermarket checkout scanners emits 633-nmnm-wavelength light in a 1.2-mmmm-diameter beam with a power of 1.3 mWmW . What is the amplitude of the oscillating electric field in the laser beam? What is the amplitude of the oscillating magnetic field in the laser beam?Suppose a radio wave has a wavelength of 2.00 meters. What it the frequency of the radiation? It may be helpful to recall that v = AF for electromagnetic waves, while v = c = 3.00 × 108 m/s. Ο Α. 150 khz О В. 1.50 Mhz О С. 15.0 Мhz O D. 150 Mh
- 25km from a uniformly transmitting antenna (call this the x-direction) the electric field points in the y-direction and has a maximum value of 30.9mV. The frequency of the radio waves is 101.1MHZ. a. What is the direction of the magnetic field? b. What is the maximum value of the magnetic field? c. How much power is being transmitted? d. How much time does it take for the waves to travel from the transmitting to this point 25km away? e. If a 30cm long, straight metal wire is used as a receiving antenna, what is the maximum voltage produced in the receiving antenna? f. Caution: this is hard, only worth 4 points. Don't use a lot of time. Hint: think Faraday's Law, put chapters 31 and 34 together. If a wire forms a small single circular of 1.00cm radius is used as a receiving antenna (WIFI uses a looped antennas around your screen), what is the maximum voltage in the receiving antenna?An electromangnetic wave has a peak magnetic field of 0.0045 T. What is its peak electric field?A source of electromagnetic waves radiates power uniformly in all directions at a single frequency. At a distance of 5.50 km from the source, a detector measures the intensity of the wave to be 26.0 μμW/m2. What is the peak value of the magnetic field at the detector due to the wave?
- A plane electromagnetic wave propagates in a vacuum in the -y-direction. The wave has a wavelength of 12 m, an angular frequency of 2.1e-9 s^-1 and the electric field is along the +x direction and has an amplitude of is 0.60 V/m. What is the mathematical expression for the magnetic field?Which of the following statements are true regarding electromagnetic waves traveling through a vacuum? (Select all that apply.) O All waves have the same wavelength. O All waves have the same frequency. O All waves travel at 3.00 x 108 m/s. O The electric and magnetic fields associated with the waves are perpendicular to each other and to the direction of wave propagation. The speed of the waves depends on their frequency.WiFi (microwaves) waves travel 100m in the x-direction from a transmitter to a computer. The maximum electric field at the computer is 77.5mV/m and points in the 2-direction. The frequency of the WiFi system is 2.4GHz. a. At the computer, the magnetic field points in what direction? b. At the computer, what is magnitude of the maximum magnetic field? C. How much power is being transmitted by the Wifi transmitter? d. How much time does it take for waves to travel from the WiFi transmitter to the computer? e. If the receiving antenna is 25cm long, what is the maximum EMF produced in the antenna from these microwaves?
- What is the average intensity of a 5.00-mm Electromagnetic wave that has a peak magnetic field of 19.0 nT?The damage threshold for the retina is 100 W/m². This means that a damage to the retina can occur at an average intensity greater than this. The light coming from a 5.0 mW green laser has a diameter of 1.2 mm. (a) Will this laser exceed the damage threshold for the retina? (b) What are the maximum values of the electric and magnetic fields of the beam coming from this laser? 2.What is the maximum strength of the B-field in an electromagnetic wave that has a maximum E-field strength of 500 V/m?