To celebrate this light year, the Perimeter Institute for Theoretical Physics (PI) offers twenty useful facts/information about light that they consider the most interesting. Invite you to read.
1 . When you come out of Earth’s atmosphere and look at the Sun, you will see that the sun is white, not yellow, the reason the sun is yellow on the ground is that the light is scattered by the atmosphere. If you’re on Venus, you can’t even see the sun because the atmosphere is so thick, and here you’ll be deaf.
2 . In fact, humans have the ability to emit light on their own, but our light is 1000 times weaker than the human eye’s ability to see.
3 . Light can penetrate as deep as 80 meters of sea water. At a depth of 2000 meters there is an angler fish, on its head there is a self-lighting spot used to lure predators, this fish looks very ugly and scary.
4. The reason leaves are green is because it reflects blue light and absorbs all other colored light for photosynthesis, if you shine green light on the plant, it will not be able to photosynthesize and will die, the Institute PI discourages you from killing trees.
5 . The aurora borealis occurs when the “wind” from a magnetic storm at the sun interacts with the earth’s atmosphere.
6 . In 1 second, the energy emitted from the sun is enough to heat up 3.2 trillion fast meals.
7 . The world’s longest-lasting light bulb today is the Centennial Light filament in California, which has been lit continuously since 1901 and has only been turned off a few times due to power outages.
8. The reflex to sneeze when blinded (looking up at the sky or looking at the sun will cause you to sneeze – this I have) is a phenomenon that occurs with about 18%-35% of humans, people have not found it yet. reason, but there is a cure is to wear glasses when looking up at the sun.
9. The phenomenon of double rainbow occurs because the light is reflected twice in the water droplets, the small rainbow will have the color of the rainbow – the big rainbow will have the opposite color of the rainbow.
10 . Our eyes cannot see everything, many other animals have much better eyes than human eyes, for example bees can see ultraviolet rays, snakes can see infrared and so on.
11 . Niagara Falls has been electrically lit since 1879, at that time the light was equivalent to 32,000 candles, now the light has been increased to the equivalent of 250 million candles.
12 . When light passes through different forms of matter, it will slow down and be redirected (refracted) so that the converging glass has the ability to gather light into one point to help you burn some ants (not recommended). encourage burning of ants).
13 . The frog’s eyes are extremely sensitive to light , and a researcher in Singapore has used frog eyes to develop an extremely sensitive photon detector.
14 . The reason LED bulbs save electricity is that it only emits light that the human eye can see , while other forms of bulbs such as filaments and fluorescents emit all kinds of light, so it consumes more electricity.
15 . Fireflies emit cold light with nearly 100% efficiency, scientists are working on how to mimic this light for the next generation of high-performance LEDs.
16 . To study how the eye perceives color, when he was young, Isaac Newton stuck a wooden needle in his eye to see if the color came from an object or from within our eyes (actually it came from both). , rod cells respond to the corresponding colored light waves).
17. If suddenly the Sun turns off the stove , it will not be until 8p17 seconds later that we will know, but don’t worry, the sun has enough energy to shine for another 5 billion years.
18 . Although it is called a Black Hole – a Cosmic Black Hole, in fact a black hole is the brightest place in this universe , its energy generated is greater than the galaxy containing it.
19. A rainbow is created when light enters the tiny water droplets in the air , the light is refracted and then reflected inside that drop of water and then refracted again when it comes out of the water droplet, this action creates out rainbow.
20. Light also has inertia, people are researching how to use this energy to make deep space travel more economical and efficient.
21. Photons can create shock waves in water or air, similar to sonic booms. Nothing can travel faster than the speed of light in a vacuum. However, light slows down in air, water, glass and other materials because photons interact with atoms, causing some interesting consequences.
Most types of light cannot be seen by the human eye.
22. Most types of light cannot be seen by the human eye. Color is our brain’s way of interpreting the wavelength of light: the distance the light travels before the waveform repeats itself. But the colors we see – called “visible” or “optical” – are only a small part of the entire electromagnetic spectrum.
23. Scientists can make measurements on single photons. Light consists of particles called photons, packets of electromagnetic fields that carry a certain amount of energy. With sufficiently sensitive experiments, you can count the number of photons or even make measurements on individual photons. The researchers even frozen the light temporarily.