In the 25-ft Space Simulator facility at NASA’s Jet Propulsion Laboratory, a bank of overhead arc lamps can produce light of intensity 2500 W/nr at the floor of the facility. (This simulates the intensity of sunlight near the planet Venus.) Find the average
Want to see the full answer?
Check out a sample textbook solutionChapter 32 Solutions
Mastering Physics with Pearson eText -- Standalone Access Card -- for University Physics with Modern Physics (14th Edition)
Additional Science Textbook Solutions
University Physics (14th Edition)
Glencoe Physical Science 2012 Student Edition (Glencoe Science) (McGraw-Hill Education)
The Cosmic Perspective (8th Edition)
Life in the Universe (4th Edition)
Cosmic Perspective Fundamentals
- Why is t1 radiation pressure of an electromagnetic wave on a perfectly reflecting surface twice as large as the pressure on a perfectly absorbing surface?arrow_forwardSuppose the maximum safe intensity of microwaves for human exposure is taken to be 1,00 W/m2. (a) 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, (b) What is the maximum electric field strength at the safe intensity? (Note that early radar units leaked more than modem ones do. This caused identifiable health problems, such as cataracts, for people who worked near them.)arrow_forwardAt the top of Earth’s atmosphere, the time-averagedPoynting vector associated with sunlight has a magnitudeof about 1.4 kW/m2.(a) What are the maximum values of the electric andmagnetic fields for a wave of this intensity? (b) What is thetotal power radiated by the sun? Assume that the Earth is1.5 × 1011m from the Sun and that sunlight is composedof electromagnetic plane waves.arrow_forward
- At what distance from a 100-W electromagnetic wave point source does Emax = 15.0 V/m?arrow_forwardAt one location on the Earth, the rms value of the magnetic field caused by solar radiation is 1.80 μT. From this value, calculate (a) the rms electric field due to solar radiation, (b) the average energy density of the solar component of electromagnetic radiation at this location, and (c) the average magnitude of the Poynting vector for the Sun’s radiation.arrow_forwardA totally reflecting disk has radius 8.00 mm and averagedensity 600 kg/m3. A laser has an average power output Pav spread uniformlyover a cylindrical beam of radius 2.00 mm. When the laser beamshines upward on the disk in a direction perpendicular to its flat surface,the radiation pressure produces a force equal to the weight of the disk.(a) What value of Pav is required? (b) What average laser power is requiredif the radius of the disk is doubled?arrow_forward
- A space probe which is a distance of 2.6×1010 mm from a star measures the total intensity of electromagnetic radiation from the star to be 5300 W/m^2 . If the star radiates uniformly in all directions, what is its total average power output?arrow_forwardIf the maximum E-component of an electromagnetic wave is 600 V/m, what is the maximum B-component?arrow_forwardProject Seafarer was an ambitious program to construct an enormous antenna, buried underground on a site about 10 000 km2 in area. Its purpose was to transmit signals to submarines while they were deeply submerged. If the effective wavelength were 1.0 * 10^4 Earth radii, what would be the (a) frequency and (b) period of the radiations emitted? Ordinarily, electromagnetic radiations do not penetrate very far into conductors such as seawater, and so normal signals cannot reach the submarines.arrow_forward
- Suppose the maximum safe intensity of microwaves for human exposure is taken to be 1.00W/m2. (a) If a radar unit leaks 10.0W 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. (b) What is the maximum electric field strength at the safe intensity? (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.)arrow_forwardSuppose the maximum safe intensity of microwaves for human exposure is taken to be 1.00 W/m2. a) If a radar unit leaks 45.0 W of microwaves (other than those sent by its antenna) uniformly in all directions, how far away (in cm) 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. b) What is the maximum electric field strength (in V/m) at the safe intensity? (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.)arrow_forwardA parabolic reflector focuses electromagnetic waves into a beam as shown in the figure. The electromagnetic radiation is pulsed, with a pulse frequency of 19.0 GHz, and the duration of each pulse is t = 1.00 ns. The face of the reflector has a radius of 3.00 cm, and the average power during each pulse is 29.0 kW. (Due to the nature of this problem, do not use rounded intermediate values in your calculations—including answers submitted in WebAssign.) (d) Determine the amplitude of the electric field (in kV/m) and magnetic field (in µT) in these electromagnetic waves. Emax= kV/m Bmax = µT (e) Assuming that this pulsed beam strikes an absorbing surface, compute the force (in µN) exerted on the surface during the 1.00 ns duration of each pulse. µNarrow_forward
- Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning