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Dec 26, 2014 · The Sun is very far away and the beams are pretty much parallel, but they're pointing towards you, and perspective makes them appear to converge towards the vanishing point - which in this case is the Sun's location in the sky.
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
Mar 20, 2019 · Approximating the sun as a black body effectively means that it's surface temperature is 5800K. And, indeed, if we look at the most dominant wavelength of the sun spectrum, the maximal intensity comes from green wavelength which corresponds to a black body emitting radiation at a temperature of 5800K.
May 31, 2015 · I will make some 5mm blackened steel letters for a building. Now, in the sunlight in summer, how hot can they get? EDIT: i want to place some LEDs on the back of the letters. now the question is ...
Feb 15, 2011 · Do you want to know both how the Earth-sun distance is measured and how the speed of light is measured? Those are completely different things. As I asked before, separate threads, please.
Sep 2, 2020 · We all know that the sun generates its energy from nuclear fusion in the core. The electromagnetic radiation produced slowly travels upwards, while constantly being absorbed and re-emitted by the charged ions, until it reaches the photosphere, where it can basically travel freely (because there are less charged ions), until it travels out into ...
Nov 10, 2023 · The Sun's energy comes primarily from fusion of light elements in its core. It is estimated that a very small fraction of mass of the Sun (~ 10−12 times the abundance of hydrogen) is uranium (both 235 and 238 isotopes). But given the huge mass of the sun (~ 2 ∗1030 kg), the mass of uranium in sun will come to around 2 ∗1018 kg, which is ...
Feb 22, 2017 · The term "solid objects" is a rather vague definition. I will try to break it down into categories and try to answer individually. But right at the beginning I can tell that the colour change observed in materials is mostly a result of chemical changes induced by UV light from the sun. By chemical changes I mean three main mechanisms; breaking of chemical bonds, formation of radicals or light ...
Nov 26, 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 from West to East. The revolution affects the difference between sidereal time and solar time, and makes the solar day ≈ 4 ≈ 4 minutes longer If the Earth spinned in the opposite direction the Sun would ...
Mar 13, 2017 · All of the answers below talk about how the spectrum of the sun is different from the spectra of incandescent lamps operating at different temperatures. (And, FYI, the spectrum of a fluorescent lamp or an LED lamp can be very different.) But is spectrum what your friend is asking about? or does your friend think that there is some other quality that distinguishes "artificial" light from ...
