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- what is the total power P radiated by the sun given the inensity of sunlight at the earth if I, the earth sun distance is R and the radius of the earth is r. Do not include any other values besides those listedarrow_forwardThe 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).arrow_forwardThe temperature of human skin is approximately 34°C. Calculate the peak wavelength of the radiation emitted from the skin.arrow_forward
- The temperature of a student's skin is 33.0°C. At what wavelength does the radiation emitted from the skin reach its peak? umarrow_forwardWhat is the intensity in W/m2 of a laser beam used to burn away cancerous tissue that, when 94.0% absorbed, puts 540 J of energy into a circular spot 2.20 mm in diameter in 4.00 s? Discuss how this intensity compares to the average intensity of sunlight (about 700 W/m2) and the implications it would have if the laser beam entered your eye. Note how your answer depends on the time duration of the exposure.arrow_forwardAssuming the earth is a perfect absorber, what is the force of the sun's radiation on the earth? Given the intensity of the sunlight on the earth is I, the earth-sun distance is R and the radius of th earth is r. Only answer with the given variablesarrow_forward
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