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How much lux does the Sun emit? - Physics Stack Exchange I want to know how much lux the sun emits on a bright day - I don't mean when one stares directly at the sun, but rather when one walks casually outside when the sun is shinning brightly. Now the
optics - If the sea surface were absolutely calm should the Sun ... 18 Jan 2021 · On the other hand, if the water were completely still, with a smooth and horizontal surface, then the sun glitter ribbon would be gone, and you would just see a direct mirror image of …
How is distance between sun and earth calculated? 15 Feb 2011 · How has the distance between sun and earth been calculated? Also what is the size of the sun?
everyday life - Why do sunbeams diverge even though the sun is … 26 Dec 2014 · Consider this picture of sun beams streaming onto the valley through the clouds. Given that the valley is only (at a guess) 3km wide, with simple trigonometry and the angles of the …
Is it possible to land on sun? - Physics Stack Exchange 19 Jan 2020 · The Sun is, of course, quite hot. A space probe built by normal materials probably would melt or burn even it’s still quite far from the Sun. However, from a theory point of view, is it …
homework and exercises - How long could the Sun power the Earth ... 5 Sep 2020 · With the energy emitted by the sun in 1 second, how long could everyone household on earth be powered? Currently we obviously can't harvest 100% of the sun's energy emissions.
Black and white matters. But why and how? - Physics Stack Exchange So a metal door in the sun will transfer the heat of the visible spectrum to the interior if painted black, will reflect it back and keep the interior cooler if painted white. It is a good reason for painting …
Why does the Sun always rise in the East? - Physics Stack Exchange 26 Nov 2014 · The Sun does not rise, it is the horizon that goes down. You say that Sun rises in the East (with a certain degree of oscillations due to the tilt of the axis) just because the Earth spins …
How hot can metal get in sunlight? - Physics Stack Exchange 31 May 2015 · I quite liked this one [archived] describing measurements on cars. It shows that things left in the sun can get significantly hotter than the surrounding air (although there are some issues …
sun - Nuclear fusion - Hydrogen isotopes - Physics Stack Exchange 15 Dec 2014 · What is the isotope composition of hydrogen atoms in the sun? Are the ratios of protium:deuterium:tritium similar to those we find on earth? What does the nuclear fusion of …