Light intensity is one of those things ... along with gravitational force, electrostatic force,
and radio-station strength ... that follows the "inverse square" law, meaning that it decreases
in proportion to the square of the distance.
So if the distance is doubled, then the light intensity is 1/(2)2 = 1/4 its original value.
As it moves away from its source, light spreads out. The amount of 'spread' depends on how far the light has gone, and this is where the difference in brightness comes from.
The amount of light received at a given distance can be calculated by the inverse square law: the amount of light from a total L at a distance d is equal to L/d2. Thus, at twice the distance, it has only one quarter the light, or equivalently a star half as far away will be four times brighter.
4 times brighter, assuming extinction is negligible (i.e., not much light is lost through interstellar dust and gas). This is an inverse-square law.
4 times brighter, assuming extinction is negligible (i.e., not much light is lost through interstellar dust and gas). This is an inverse-square law.
4 times brighter, assuming extinction is negligible (i.e., not much light is lost through interstellar dust and gas). This is an inverse-square law.
4 times brighter, assuming extinction is negligible (i.e., not much light is lost through interstellar dust and gas). This is an inverse-square law.
Excluding the Sun, the brightest star as seen from Earth is Sirius, which is about twice as far away as the nearest (known) star, Proxima Centauri.
The second brightest star is Canopus. Sirius isn't intrinsically especially bright, if it weren't so close, it wouldn't be particularly noticeable. Canopus, on the other hand, is intrinsically extremely bright, but it's also over 30 times further away. Canopus is (probably) the brightest star within 700 light years or so.
Rigel, 700 light years away, is the brightest star within over 1000 light years of Earth, and visually is the sixth brightest star in the night sky.
Sirius is also known as Alpha Canis Majoris. One of the other stars in that constellation, Delta Canis Majoris, is fairly far down the list of bright stars at 37... but it's 1800 light years away. If it were at the same distance as Sirius, it would cast shadows on Earth, and would actually be not just the brightest star, but the brightest object in the night sky about half the time, brighter than any of the planets and even brighter than the Moon from third quarter to first quarter. Eta Canis Majoris is even brighter than Delta, but even further away.
Depending on the distance. If one star is 10 times farther away than another, identical, star, the star that is nearer will seem 100 times as bright. In general, the brightness is inversely proportional to the square of the distance.
This is, assuming no light gets absorbed by interstellar dust or gases.
"inverse square" = 4 times as bright (1.86 magnitudes)
4 times brighter, assuming extinction is negligible (i.e., not much light is lost through interstellar dust and gas). This is an inverse-square law.
4 times as bright.
4
4 times
twice
twice
Jim lovell has been in space four times, twice in the Gemini spacecraft and twice in the Apollo spacecraft. He also becomes the first man to fly twice around the moon , and still not put his foot on the lunar surface.
Of the seven main stars that make up the Big Dipper. From the Pan to the Handle. * Dubhe - 30 times larger than our Sun * Merak - Twice the size of our Sun * Phecda - 3 times the Sun * Megrez - Estimated twice the size of the Sun * Alioth - Just under four times the Sun * Mizar - (It's Quadruple system) - largest about 4 times that of the Sun * Alkaid - Just under twice the Sun
umm... no. The moon is about 4 times smaller than the Earth
4 times
It is four times as brighter. It is four times as brighter.
4 times as bright.
4 times as bright. This is calculated as 1/22.
4 times brighter.
four times
Who wants to be a millionaire with Eddie Macguire says that it is 4 times as bright but i can not give a scientific reason for this answer
Meiosis happens twice to create FOUR non-identical cells. If it only happened once, only TWO non-identical cells would be made. When it happens twice, FOUR non-identical cells are made.
Light intensity is one of those things ... along with gravitational force, electrostatic force,and radio-station strength ... that follows the "inverse square" law, meaning that it decreasesin proportion to the square of the distance.So if the distance is doubled, then the light intensity is 1/(2)2 = 1/4 its original value.
no thats the obvious answer
No, thats a square because its multiplied by itself 2 times, which means is a square. 2 Times = 2d = Square 3 Times = 3d = Cube 4 Times = 4d = Tesseract? 5 Times = 5d = 5th-demicube?
twice