A barking dog delivers about 1 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m from the dog?
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- While sailing in the ocean a sailor sees a lighthouse, but doesn’t know how far away it is. The sailor anchors their boat and measures the inten- sity of the light. They then lift their achor and sail 500 m closer to the lighthouse, noting that the intensity is now double their previous mea- surement. Given that the lamp in the lighthouse remains at a constant power and is far enough away to be considered a point source, calculate how far the lighthouse is from the sailor’s initial position.The Sun delivers an average power of 583.9 W/m2 to the top of Mars's atmosphere. Find the magnitudes of B max and Emax for the electromagnetic waves at the top of the atmosphere. Bmax = Emax =75cm The intensity of sunlight sdeiking the earth is 1.4kW/m². what is the maximum power that could possibly be abrorbed by the earcth? (The earth's radius is 4000 miles) How does this Compare with the average power dlemands af humankind! Given the earth-sun distarice of 93 million miles, of I50 million miles, and the mars -Sun distance what is the intenrity of sunlight shriking mars? The 6 pluto-sun dirtance is about 4. billion miles; what is intinidy on pluta?
- consider a bright star in our sky. assume its distance from earth is 38.3 light-year (ly) and its power output is 4.00 * 10^28 W. about 100 times that of the sun. one light-year is the distance traveled by light through a vacuum in one year. a. find the intensity of the starlight at the earth. b. find the power of the starlight at the earth intercepts ( the radius of earth is 6.38 * 10^6 m .)If a distant galaxy is receding from the earth such that the emitted radiation wavelength is shifted by a factor of two, what is the speed of the galaxy relative to the earth ?A hanging lamp with a 70-W omni-directional bulb has a hemi-spherical lamp shade of height, H = 0.55 m, as shown below. (a) Find the total (average) power received across the shade. W (b) Calculate the intensity at a point on the shade. W/m²
- The energy flow to the earth from sunlight is about 1.4 kW/m2.(a) Find the maximum values of the electric and magnetic fields for a sinusoidalwave of this intensity. (b) The distance from the earth to the sunis about 1.5 * 10^11 m. Find the total power radiated by the sun.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?7. A flashlight produces an average intensity of 476 W/m^2 shining on a wall. What is the maximum magnetic field strength in the light waves striking the wall? 3.80E-06 T 2.00E-06 T 1.60E-06 T 1.20E-06 T