What is the light

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Visible light is part of the electromagnetic spectrum extending from 700 nm wavelength, up to 400 nm wavelength, in other words visible light is a part of the electromagnetic wave that is generated and has all wavelengths.
There are many attempts to measure the speed of light throughout history. It is logical and logical to think of the law of speed, which states that it is equal to distance divided by time, but with light, it is not that simple, it is very fast, Which is equal to (299,792,458 m / s).

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How to Determine the Age of a Parrot

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In most parrots, if there is a line or strip between the head and the skin cap, the parrot is less than 3-4 months old. If there is no bar in this location, it means that the parrot has changed its feathers at least once. More than 3-4 months. Some parrot birds can not apply this test to determine their age, namely lutino birds, and the parrot (Albino) which has no feather marks due to a genetic mutation.
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History of the Great Wall of China

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The construction of the Great Wall of China dates back to the third century BC, and many of the fortresses in the wall date back hundreds of years. Before that, China was divided into a number of kingdoms during the Warring States Period. Around 220 BC. Qin Shi Huang, the first king of the United China, ordered the removal of ancient fortresses, the merging of ancient fences along the northern border and the construction of a single wall of more than 5,000 kilometers to protect China from attacks from the north.
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The most beautiful areas in Qatar

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Celine Beach This resort is considered one of the most beautiful coastal places overlooking the sea. It has many recreational and leisure facilities such as: chalets, swimming pools, facilities and public services of all kinds, places of practice of marine sports, etc. The location of this product is close to the capital, Hour drive. The Lagoon Resort It is a seaside resort, with many hiking spots, and is characterized by plenty of apartments, taking its name from its area. Palm Island The hotel offers a range of restaurants serving seafood and international cuisine. It also has excellent places for children's entertainment, as well as the old maritime transport, which is the history of the State of Qatar.
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