The safety limit in the UK for radio power density is 1 mW/cm2 at 100 MHz....
The safety limit in the UK for radio power density is 1 mW/cm2 at 100 MHz. The electrical field in a workshop was measured at 100 dB μV/m at this frequency. Justify if the field in this workshop is within the UK limit.
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The safety limit in the UK for radio power density is 1 mW/cm2
at 100 MHz....
Find the wavelength for (a) a typical AM radio wave with a frequency of 1000 kHz and (b) a typical FM radio wave of 100 MHz.
Find the wavelength for (a) a typical AM radio wave with a frequency of 1000 kHz and (b) a typical FM radio wave of 100 MHz. 3. What is the frequency of a 3-cm microwave? 4. What is the frequency of an X ray with a wavelength of 0.1 nm? 5. What is the maximum strength of the B -field in an electromagnetic wave that has a maximum E -field strength of 1000 V/m? 6. Calculate the wavelengths of a 1530-kHz AM radio signal,...
f. You bought a PEMFC with efficiency S4 % and active area 100 cm, what is the output voltage of the Fuel cell? Suppose power density of this fuel cell S0 mw/cm2, what is the output current of this f...
f. You bought a PEMFC with efficiency S4 % and active area 100 cm, what is the output voltage of the Fuel cell? Suppose power density of this fuel cell S0 mw/cm2, what is the output current of this fuel cell? (Points 3+3-6)
f. You bought a PEMFC with efficiency S4 % and active area 100 cm, what is the output voltage of the Fuel cell? Suppose power density of this fuel cell S0 mw/cm2, what is the output current...
Question 15 (1 point) A power density of 50 W/cm2 can be absorbed by the rods...
Question 15 (1 point) A power density of 50 W/cm2 can be absorbed by the rods and the cones found in the retina. Beyond this power density, thermal damage starts occurring in the retina. A dye laser is tuned at 1 = 471 nm and is impinging on the cornea and is then focused on the retina. The focusing system of the eye has a focal length of about f= 20 mm. Find the power density on the cornea of...
A radio antenna emits EM waves at a frequency of 100 MHz and intensity of 0.2...
A radio antenna emits EM waves at a frequency of 100 MHz and intensity of 0.2 W/m? What is the photon density in one cubic meter of the beam? O 1.0E12 photons/cubic meter O 1.0E 16 photons/cubic meter O 1.0E20 photons/cubic meter O 1.4E31 photons/cubic meter O 6.1E32 photons/cubic meter
Question 10 5 pts A radio antenna emits EM waves at a frequency of 100 MHz...
Question 10 5 pts A radio antenna emits EM waves at a frequency of 100 MHz and intensity of 0.2 W/m2. What is the photon density in one cubic meter of the beam? M C 1.0E12 photons/cubic meter C 1.0E 16 photons/cubic meter C 1.0E20 photons/cubic meter 1.4E31 photons/cubic meter C 6.1E32 photons/cubic meter
5. (a) A radio station broadcasts at a frequency of 91.5 MHz (1 MHz = 106...
5. (a) A radio station broadcasts at a frequency of 91.5 MHz (1 MHz = 106 Hz). At a receiver some distance from the antenna, the maximum magnetic field of the electromagnetic wave detected is 2.10 x 10-11 T. (i) (2 pts) What is the maximum electric field of the electromagnetic wave at this receiver? (ii) (1 pt) What is the wavelength of the electromagnetic wave? (b) Sunlight strikes a piece of crown glass at an angle of incidence of...
5. (a) A radio station broadcasts at a frequency of 91.5 MHz (1 MHz = 10...
5. (a) A radio station broadcasts at a frequency of 91.5 MHz (1 MHz = 10 Hz). At a receiver some distance from the antenna, the maximum magnetic field of the electromagnetic wave detected is 2.10 x 10-11 T. ) (2 pts) What is the maximum electric field of the electromagnetic wave at this receiver? (ii) (1 pt) What is the wavelength of the electromagnetic wave? (b) Sunlight strikes a piece of crown glass at an angle of incidence of...
Consider the following signal power levels: 50 uW, 1 mW and 100 mW. (a) Calculate these...
Consider the following signal power levels: 50 uW, 1 mW and 100 mW. (a) Calculate these power levels in dBm. (b) Calculate, in dBmV and dBuV, the voltages corresponding to those power levels measured on a resistance of 50 22. [A: (a) -13 dBm, 0 dBm, 20 dBm; (b) 34 dBmV, 94 dBuV, 47 dBmV, 107 dBuV, 67 dBmV, 127 dBuV]
5. (a) A radio station broadcasts at a frequency of 91.5 MHz (1 MHz = 106...
5. (a) A radio station broadcasts at a frequency of 91.5 MHz (1 MHz = 106 Hz). At a receiver some distance from the antenna, the maximum magnetic field of the electromagnetic wave detected is 2.10 x 10-11 T. (i) (2 pts) What is the maximum electric field of the electromagnetic wave at this receiver? (ii) (1 pt) What is the wavelength of the electromagnetic wave? (b) Sunlight strikes a piece of crown glass at an angle of incidence of...
The FM radio station KAMB broadcasts from an antenna atop a 170 meter tall radio tower at a frequency of 90 MHz with a total radiated power of 40 kilowatts. Neighbors have complained about problems th...
The FM radio station KAMB broadcasts from an antenna atop a 170
meter tall radio tower at a frequency of 90 MHz with a total
radiated power of 40 kilowatts. Neighbors have complained about
problems they attribute to excessive radiation from the tower, but
the city engineer who measured the radiation level near the base of
the tower found it to be well below the accepted standard. You have
been hired by the HOA to assess the engineer's report. You...
f. You bought a PEMFC with efficiency S4 % and active area 100 cm, what is the output voltage of the Fuel cell? Suppose power density of this fuel cell S0 mw/cm2, what is the output current of this fuel cell? (Points 3+3-6)
f. You bought a PEMFC with efficiency S4 % and active area 100 cm, what is the output voltage of the Fuel cell? Suppose power density of this fuel cell S0 mw/cm2, what is the output current...
Question 15 (1 point) A power density of 50 W/cm2 can be absorbed by the rods and the cones found in the retina. Beyond this power density, thermal damage starts occurring in the retina. A dye laser is tuned at 1 = 471 nm and is impinging on the cornea and is then focused on the retina. The focusing system of the eye has a focal length of about f= 20 mm. Find the power density on the cornea of...
A radio antenna emits EM waves at a frequency of 100 MHz and intensity of 0.2 W/m? What is the photon density in one cubic meter of the beam? O 1.0E12 photons/cubic meter O 1.0E 16 photons/cubic meter O 1.0E20 photons/cubic meter O 1.4E31 photons/cubic meter O 6.1E32 photons/cubic meter
Question 10 5 pts A radio antenna emits EM waves at a frequency of 100 MHz and intensity of 0.2 W/m2. What is the photon density in one cubic meter of the beam? M C 1.0E12 photons/cubic meter C 1.0E 16 photons/cubic meter C 1.0E20 photons/cubic meter 1.4E31 photons/cubic meter C 6.1E32 photons/cubic meter
5. (a) A radio station broadcasts at a frequency of 91.5 MHz (1 MHz = 106 Hz). At a receiver some distance from the antenna, the maximum magnetic field of the electromagnetic wave detected is 2.10 x 10-11 T. (i) (2 pts) What is the maximum electric field of the electromagnetic wave at this receiver? (ii) (1 pt) What is the wavelength of the electromagnetic wave? (b) Sunlight strikes a piece of crown glass at an angle of incidence of...
5. (a) A radio station broadcasts at a frequency of 91.5 MHz (1 MHz = 10 Hz). At a receiver some distance from the antenna, the maximum magnetic field of the electromagnetic wave detected is 2.10 x 10-11 T. ) (2 pts) What is the maximum electric field of the electromagnetic wave at this receiver? (ii) (1 pt) What is the wavelength of the electromagnetic wave? (b) Sunlight strikes a piece of crown glass at an angle of incidence of...
Consider the following signal power levels: 50 uW, 1 mW and 100 mW. (a) Calculate these power levels in dBm. (b) Calculate, in dBmV and dBuV, the voltages corresponding to those power levels measured on a resistance of 50 22. [A: (a) -13 dBm, 0 dBm, 20 dBm; (b) 34 dBmV, 94 dBuV, 47 dBmV, 107 dBuV, 67 dBmV, 127 dBuV]
5. (a) A radio station broadcasts at a frequency of 91.5 MHz (1 MHz = 106 Hz). At a receiver some distance from the antenna, the maximum magnetic field of the electromagnetic wave detected is 2.10 x 10-11 T. (i) (2 pts) What is the maximum electric field of the electromagnetic wave at this receiver? (ii) (1 pt) What is the wavelength of the electromagnetic wave? (b) Sunlight strikes a piece of crown glass at an angle of incidence of...
The FM radio station KAMB broadcasts from an antenna atop a 170
meter tall radio tower at a frequency of 90 MHz with a total
radiated power of 40 kilowatts. Neighbors have complained about
problems they attribute to excessive radiation from the tower, but
the city engineer who measured the radiation level near the base of
the tower found it to be well below the accepted standard. You have
been hired by the HOA to assess the engineer's report. You...
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