Geography
Geography, 10.10.2019 03:00, mandy9386

4. describe the mathematical relationship between the amount of solar flux a planet receives and the distance from its sun. how much would the flux change if the earth were 2 times the current distance from the sun? use the value from question 4 to calculate that fux

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Physics, 13.07.2019 03:20, mnikitha07
Earth's temperature the sun emits energy at a rate of about 3.9 · 1026 w. at earth, this sunshine gives an incident energy flux i, of about 1.4kw m”. in this problem, you'll investigate whether any other planets in our solar system could support the sort of water-based life we find on earth. consider a planet orbiting at a distance d from the sun (and let de be earth's distance). the sun's energy flux at distance d is 7 = le(d,/d)2, because energy flux decreases as the inverse square of distance. call the plant's radius r, and suppose that it absorbs a fraction a of the incident sunlight, reflecting the rest back into space. the planet intercepts a disk of sunlight of area 7r? , so it absorbs a total power of tr’al. earth's radius is about 6400 km.
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Physics, 14.07.2019 00:10, quan5379
The total solar irradiance (tsi) at earth orbit is 1400 watts/m2 . assuming this value can be represented as a single poynting flux. find the corresponding flux at the solar visible-light surface. explain your methods. (distance between sun & earth is 150 million km)
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Geography, 10.10.2019 02:20, ednalovegod
Apply the concepts of blackbodies, flux, luminosity, inverse-square law, etc. the first exoplanet to be discovered around a so-called main-sequence star was a half-­‐jupiter mass planet orbiting very close to the star 51 pegasi (mv = +5.49 mag, d = 15.61 pc). a. calculate the absolute visual magnitude (mv) of 51 peg. b. the sun’s absolute magnitude is mv = 4.8. using your answer to (a), calculate the ratio of the luminosity of 51 peg to the sun (lsun). [hint: review the relationship between luminosity, flux, and distance, as discussed in class.] c. the spectrum of 51 peg peaks at a wavelength of 520 nm. use wien’s law to calculate the temperature of 51 peg. d. the sun’s surface temperature is 5780 k. using equation (5.100) in the reading, calculate the ratio of the radius of 51 peg to the sun (rsun). e. if the planet 51 peg b orbits at a radius of 0.053 au in 4.23 days, how many times larger is the incident flux on the planet’s atmosphere than the solar flux at the earth?
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