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What percent of directly incident sunlight is transmitted into water (n=1.33)? (Give your answer as a percent.)
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- 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).What is the frequency of infrared light of 1.0*10^-4 wavelength?The incident radiation on the earth's surface can be approximated by Ii = In cos 0, where In = 80 W/m2. sr is the total radiation intensity directed perpendicular to the surface. What is the total irradiation at the surface of the earth?
- Humans are unable to convert radiant energy from the sun into stored energy that can be usedto do work. Plants, however, obtain their energy from photosynthesis – sunlight is used toconvert carbon dioxide and water into sugars (stored as an energy source) and oxygen.Consider a leaf with a surface area of 2.5 cm2. On a sunny day it might receive sunlight withan average power per unit area of 350 W/m2. Of this incident light, only about 40% is usefulfor photosynthesis. (a) If the process was perfectly efficient (i.e. all the useful radiation was converted tostored internal energy), calculate the increase in internal energy of the leaf in aperiod of one hour. (b) In practice, the overall efficiency of the process (percentage of energy storedrelative to the total incident energy reaching the surface of the leaf) is only about6%. Discuss, in relation to the First Law of Thermodynamics, what happens to theremaining energy?The average Earth-Sun distance is 1.00 astronomical unit (AU). At how many AUs from the Sun is the intensity of sunlight 1/49 the intensity at the Earth? AUAn infrared satellite measures outgoing radiation that leaves Earth's surface through an atmospheric window. The observed spectral irradiance at a wavelength of 10 μm is 2.199×107 W m-2 m-1. What is the temperature of the surface? Give your answer in K.
- The average intensity of sunlight on Earth’s surface is about 1000 ? ?2 ⁄ a. Calculate the solar panel area if the amount of energy that falls on it in 10 hours is 3 × 1012J.b. What intensity would such sunlight have if concentrated by a magnifying glass onto an area 100 times smaller than its own?The Sun is at a 62 degree angle to the ground and a solar module with an area of 1 square metre is installed horizontal to the ground. What is the total usable solar energy striking the module if we assume incoming solar radiation of 1000 W/m2? 883 watts 469 watts 1136 watts 620 wattsFind the range in wavelengths (in vacuum) for visible light in the frequency range between 4x1014 Hz (red light) and 7.9 x1014 Hz (violet light). Express the answers in nanometer. (1 nm = 10-9m)
- A photon has an energy of 1.9 meV (milli electron Volt). What is the wavelength of this photon, expressed in micrometers? Keep four significant digits. And the answer is NOT 6.543Calculate the wavelengths of a 4.97-GHz cell phone signal. Express your answer in meters. Normal format with 3 SF.The brightness of the Sun as observed from the Moon can be used to design a solar panel array at a colony on the Moon. The Moon is 1.5 × 1011 m from the Sun. The array can convert energy from the brightness of the Sun into electricity at an efficiency factor of 39 percent. The power produced by the array is the efficiency factor times the product of the brightness (B) and area of the array (A): PRequired=(Efficiency)BA . What is the necessary area of the solar panel array, in square meters, to produce 39 kW? A = __m2.