6. The intensity of sunlight striking the earth is 1.4 kW/m^2. What is the maximum power that could possibly be absorbed by the earth? (The earth's radius is 4000 miles). How does this compare with the power demands of humankind? Given that the earth-sun distance is 93 million miles, and the pluto-sun distance is 4 billion miles, what is the intensity of sunlight striking pluto?
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- 4. The average irradiance of solar radiation at the earth is 1.4 kWm2. Most is absorbed; calculate the total force on the whole earth. The mean radius of the Earth is.6.4 x 106 m.In Fort Collins, Colorado, the sun shines for an average of 1850 hours per year. A homeowner installs a set of solar panels that provide 4.0 kW of electric power when the sun shines. If the local utility charges $0.13/kWh, how much will she save each year on electricity because of her solar panels?Solar cells generate a potential difference when exposed to sunlight. In an experiment, you wish to charge a rechargeable battery by connecting it in series to an array of solar cells. You perform the experiment outdoors, in direct sunlight, when the intensity of solar radiation is 1000 W/m2. However, your solar cells only have an efficiency of 11% (that is, only 11% of the sunlight power transmitted to the solar cells is delivered to the rechargeable battery). While the circuit is connected, you measure at one instant the potential difference across the battery to be 4.90 V and the current in the circuit to be 0.25 A. What is the area of the array of solar cells? _____________ m2
- An old-fashioned incandescent bulb (100 W) has a tungsten filament inside which glows at a steady temperature of 24000C and radiates electromagnetic waves (part heat, part light). What is the surface area of the filament? Assume emissivity of tungsten is 0.35. a) 9.9*10-4 m2 b) 9.9*10-5 m2 c) 1.5*10-4 m2The power radiated by the sun is 3.9 x 1026 W. The earth orbits the sun in a nearly circular orbit of radius 1.5 x 1011 m. The earth's axis of rotation is tilted by 23.4° relative to the plane of the orbit (see the drawing), so sunlight does not strike the equator perpendicularly. What power strikes a 0.30-m² patch of flat land at the equator at point Q? Number Units Sunlight Axis of rotation Equator 23.4Problem: Radiation Related The energy flux associated with solar radiation incident on the outer surface of the earth's atmosphere has been accurately measured and is known to be 1,368 W/m^2. The diameters of the sun and earth are 1.39 X 10^9 and 1.27 x 10^7 m, respectively, and the distance between the sun and the earth is 1.5 × 10^11 m. (a) What is the emissive power of the sun? (b) Approximating the sun's surface as black, what is its temperature? (c) At what wavelength is the spectral emissive power of the sun a maximum? (d) Assuming the earth's surface to be black and the sun to be the only source of energy for the earth, estimate the earth's surface temperature.
- Ch 24, Problem 31 The power radiated by the sun is 3.9 × 1026 W. The earth orbits the sun in a nearly circular orbit of radius 1.5 × 1011 m. The earth's axis of rotation is tilted by 23.4° relative to the plane of the orbit (see the drawing), so sunlight does not strike the equator perpendicularly. What power strikes a 0.72-m2 patch of flat land at the equator at point Q?One recent study has shown that x rays with a wavelength of 0.0050 nm can produce mutations in human cells.a. Calculate the energy in eV of a photon of radiation with this wavelength.b. Assuming that the bond energy holding together a water molecule is typical, use the given table to estimate how many molecular bonds could be broken with this energy.The energy flux from the sun has a peak value of around 1500 W/m2, and solar cells are around 15% efficient. Estimate the area needed to satisfy US energy needs using solar cells, using the estimates that there are about 350 million people in the US and that we use an average of 90 kW/person. Also assume that there are about 6 hours of "peak" sunlight per day. Answer in square kilometers (do not put units in your answer, however).
- The time-averaged intensity of sunlight that is incident at the upper atmosphere of the earth is 1,380 watts/m2. What is the maximum value of the electric field at this location? a. 660 N/C b. 1,950 watts/m2 c. 1,200 N/C d. 840 N/C e. 1,020 N/C3. On a cloudless day, the sunlight that reaches the surface of the earth has an intensity of about 1.50 x 103 W/m². What is the electromagnetic energy contained in 5.10 m3 of space just above the earth's surface?Question 1 The electromagnetic (EM) spectrum spans from radio waves up to gamma rays. Match the frequencies or wavelengths to the correct part of the EM spectrum. v UV а. 550 nm v infrared light b. 2 pm v gamma rays c. 2 microns v radio wave d. 2 PHz v visible e. 1420 МHz Question Help: Message instructor Submit Question