A 75-kW radio station broadcasts its signal uniformly in all directions, What is the average intensity of its signal at a distance of 250 m from the antenna?
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Q: wavenumber and wavelength
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- If the Average Power Density of an antenna is given as: 60sin (0) Wav = (WIm²) a) What is the value of the Average Power Density at (0 = 30°) and (r = 2 m) = %3D (W/m?) b) What is the value of the Radiation Intensity at (0 = 45°) and (r = 3 m) = %3D %3D (W/Steradian) c) What do we call an antenna that has repeated (more than one identical) elements?Suppose the maximum safe average intensity of microwaves for human exposure is taken to be 1.00 W/m2. If a radar unit leaks 10.0 W of microwaves (other than those sent by its antenna) uniformly in all directions, how far away, ?min, must you be to be exposed to an average intensity considered to be safe? Assume that the power spreads uniformly over the area of a sphere with no complications from absorption or reflection. ?min= m What is the maximum electric field strength ?0 at this distance? The permittivity of free space is ?0=8.854×10−12 C2/(N·m2). The speed of light is ?=3.00×108 m/s. ?0= V/m Note: Early radar units leaked more than modern ones do. This caused identifiable health problems, such as cataracts, for people who worked near them.An intense light source radiates uniformly in all directions. At a distance of 6 m from the source, the radiation pressure on a perfectly absorbing surface is 5.0 x 10-6 Pa. What is the total average power output of the source? (kW)
- An intense light source radiates uniformly in all directions. At a distance of 5.0m from source, the radiation pressure on a perfectly absorbing surface 9 micro pascals. What is the total average power output of the source?The intensity of a particular TV station’s signal is I =1.01 x 10^(-13) W/m^2 when it arrives at a 28-cm diameter satellite TV antenna. A) Calculate the total energy received by the antenna during 5.0 hours and 40 minutes of viewing this station’s programs. B)What is the amplitude of the field of the EM waves? (E field)Suppose the maximum safe intensity of microwaves for human exposure is taken to be 1.81 W/m2. If a radar unit leaks 10.0 W of microwaves (other than those sent by its antenna) uniformly in all directions, how far away must you be to be exposed to an intensity considered to be safe? Assume that the power spreads uniformly over the area of a sphere with no complications from absorption or reflection. (Note that early radar units leaked more than modern ones do. This caused identifiable health problems, such as cataracts, for people who worked near them.)
- A parabolic satellite dish is somewhat bowl-shaped, but the incoming signal is captured across its circular cross-section. A parabolic satellite dish with radius, R = 1.5 m, picks up a TV signal with a peak electric field strength of 74 mV/m. (a) What is the average intensity of the incoming signal? W/m² (b) What is the average (total) power received by the satellite dish? W R (c) What is the average output power of the orbiting transmitter if it broadcasts uniformly over an area of 1.5 x 10¹3 m²? MWPlease help with A, B, and CSuppose the maximum safe average intensity of microwaves for human exposure is 1.00 W/m2. Early radar units leaked radiation more than modern ones do, which caused identifiable health problems, such as cataracts, for people who worked near them. Part (a) If a radar unit leaks 6.5 W of microwave radiation uniformly in all directions, what is the closest distance, in centimeters, you can be to the unit and still be considered safe? Assume that the power spreads uniformly over the area of a sphere with no complications from absorption or reflection. Part (b) What is the maximum electric field strength E0, in volts per meter, of the microwave radiation at the maximum safe intensity?