Suppose the maximum safe intensity of microwaves for human exposureis taken to be 1.32 W/m². If a small radar unit leaks 10.0 W ofmicrowaves (other than those sent by its antenna) uniformly in alldirections, how far away must you be to be exposed to an intensityconsidered to be safe? Assume that the power spreads uniformly overthe area of a sphere with no complications from absorption or reflection.(Note that early radar units leaked more than modern ones do. Thiscaused identifiable health problems, such as cataracts, for people whoworked near them.)

Given:Maximum intensity of radiated microwave = 1.32 W/m²Power output of the radar = 10.0W…

Answered: Suppose the maximum safe intensity of…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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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 isotropic light source emits rays of 50 W at a wavelength of 500 nm. A light detector is 200 m from the source. What is the maximum value of the rate of change of the magnetic field of the light in dB/dt over time at the detector location?
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? MW
An AM radio transmitter broadcasts 45 kW of power uniformly in all directions.Randomized VariablesP = 45 kWd = 29 km Part (a) Assuming all of the radio waves that strike the ground are completely absorbed, and that there is no absorption by the atmosphere or other objects, what is the intensity 29 km away? Part (b) What is the maximum electric field strength at this distance, in N/C?
A radio wave transmits 44.0 W/m2 of power per unit area. A flat surface of area A is perpendicular to the direction of propagation of the wave. Assuming the surface is a perfect absorber, calculate the radiation pressure on it.
What is the radiation pressure 1.2 m away from a 600 W lightbulb? Assume that the surface on which the pressure is exerted faces the bulb and is perfectly absorbing and that the bulb radiates uniformly in all directions.
Suppose 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?
An electromagnetic wave is normally incident on a flat surface. Assuming the power per unit area transmitted is S = 56.5 W/m2, and the surface is a perfect absorber, what is the radiation pressure (in nPa) on the surface? nPa Need Help? Read It the the line that through the tu
On its highest power setting, a microwave oven increases the temperature of 0.400 kg of spaghetti by 45.0 °C in 120 s. (a) What was the rate of energyabsorption by the spaghetti, given that its specific heat is 3.76 × 103 J/kg · °C ? Assume the spaghetti is perfectly absorbing. (b) Find the average intensity of the microwaves, given that they are absorbed over a circular area 20.0 cm in diameter. (c) What is the peak electric field strength of the microwave? (d) What is its peak magnetic field strength?
A quarter-wave monopole radio antenna (also called a Marconi antenna) consists of a long conductor of one quarter the length of the transmitted wavelength. The lower end of the antenna is connected to a conducting ground plane (often simply the Earth) which reflects the transmitted signal, creating an effective antenna length of a half wavelength. (a) What must be the height of the antenna (in m) for a radio station broadcasting at 569 kHz? (b) What must be the height of the antenna (in m) for radio stations broadcasting at 1,750 kHz?
A certain 60.0 Hz AC power line radiates an electromagnetic wave having a maximum electric field strength of 45.2 kV/m. (a) What is the wavelength of this very low frequency electromagnetic wave? (b) What is its maximum magnetic field strength?

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