In 1928, the physicist Paul Dirac was looking for an equation that would predict how very fast particles should behave. There was already another equation that could describe slow-moving particles, the Schrödinger equation, but Einstein's theory of special relativity said that fast particles could be very different from slow particles. Dirac knew that particles like electrons were usually moving very fast. He realized the old equation would not make good predictions for fast particles. So he came up with a new equation that could describe particles moving close to the speed of light.
For fast particles, it is no longer true that the energy is formula_1. Instead, Dirac's new equation worked for particles where the energy was given by formula_3. In the new equation for energy, the symbol formula_4is called the momentum, and it measures how fast the particle is going and how hard it is to stop. This equation says that very fast particles have more energy, so they are different from slow particles. You can take the square root of each side of this equation, since both sides are equal. However, any real square root has two answers, formula_5and formula_6. You can think of the answer with negative energy as being antimatter.
The reason this is important to understand antimatter is because scientists found that when matter and antimatter touch each other, the amount of energy that is released comes very close to the amount of energy formula_1 says should be all together in those two pieces. The reason is that each particle of matter, when it touches its antiparticle in the antimatter world, both change over into pure energy, or annihilate each other. This release of such a high amount of energy is why a lot of science fiction writers use antimatter for fuel in their stories. For example, author Dan Brown uses antimatter in "Angels and Demons" as a very powerful weapon. It is also being looked at as a fuel source for real-life missions to outer space in the future.
Many scientists think that in the first few moments after the Big Bang, which created the universe a very long time ago, both matter and antimatter mixed together. If the Big Bang made equal amounts of matter and antimatter, then the two would annihilate and become energy. After a long time, there would be no matter and no antimatter left, just energy. But our universe today looks like it is almost all matter and hardly any antimatter. Physicists do not yet know for sure that equal amounts of matter and antimatter were created, and because of this, they are also wondering where the antimatter went, and if any was left over from the beginning of the universe.
One explanation is that there was just a little bit more matter than antimatter in the beginning, so that whatever was left over after most of the matter and antimatter annihilated into energy became the mostly-matter universe we see today. Another theory is that there is lots of antimatter on the other side of the universe, hidden far beyond our vision. They could have formed their own galaxies and solar systems too.
Because antimatter can make so much energy, it can be used for a lot of things, such as fuel for going into outer space, or in our cars. The problem is that antimatter is very expensive to make, and is almost as expensive to store, since it cannot touch regular matter. It takes several hundred million dollars to make less than one-millionth of a gram of antimatter. In fact, it is the most expensive and the rarest substance on Earth. Since it is so expensive, this means that antimatter is not practical to use as a weapon or as an energy source, because so little of it is obtainable.
Recently, however, scientists have trapped antimatter for over 16 minutes (1000 sec. total).
It does have a use in medicine, because a special kind of scanner called the PET, which stands for positron emission tomography, uses positrons to go into the human body. Doctors can look at the way the positron changes into energy inside a person's body, and be able to tell if something is wrong inside a person. This kind of machine works differently than an X-ray machine or a magnetic resonance imaging (MRI) machine, and can help doctors see things that those other machines cannot see.
Minsk
Minsk or Miensk (Мінск (official spelling in Belarus), Менск; Минск ; Mińsk) is the capital and a major city of Belarus. About 2 million people lived in the city as of 2021. Minsk is also a headquarters of the Commonwealth of Independent States. As a capital, Minsk has a special administrative status in Belarus and is also the capital of Minsk voblast (province) and Minsk raion. Minsk is built next to the Svislach and Niamiha rivers. The timezone in Minsk is GMT +2.
The oldest mentions of Minsk date back to the 11th century (1067). In 1326 Minsk became a part of the Grand Duchy of Lithuania and received its town privileges in 1499. From 1569 it was a capital of the Minsk Voivodship in the Polish-Lithuanian Commonwealth. It was annexed by Russia in 1793 as a result of the Second Partition of Poland. During 1919–1991 Minsk was the capital of the Byelorussian SSR. In 2019, Minsk hosted the European Games.
Mercedes
Mercedes:
1310s
1326
Chancellor of Germany
The chancellor of Germany (German: "Bundeskanzler", literally: "federal chancellor") is the head of government of the Federal Republic of Germany. The Chancellor of Germany is elected by the majority of the members of the Bundestag, the German parliament. The chancellor is the German people's version of a Prime Minister or Premier.
The current chancellor is Angela Merkel (CDU), the first woman to be elected in this position.
Mysore
Mysore is a city in Karnataka, India. Mysore is south-west of Bangalore. Travel time from Bangalore to Mysore is 2-3 hours by road or rail. Mysore is the second largest city in Karnataka.
Mysore Palace, Jaganmohan Palace, Chamundi Hills, Brindavan Gardens, and Mysore Zoo are the places to see in Mysore. Some people go to Mysore to see the Dasara procession.
People also go to Mysore to learn yoga.
Kannada
Kannada () is a language, and it is a script used for writing the language. Most people in the southern Indian state of Karnataka speak Kannada, and there are speakers in Andhra Pradesh, Tamil Nadu, Maharashtra, Kerala and Goa. There are some differences in the way Kannada is spoken in these places.There are about 44 million people who speak the language.It had been since 2nd Century.
Kannada is a Dravidian language, which is a different language family from the Indo-European or Aryan languages of the north, such as Hindi but close to the other southern languages like Telugu. It has about 3000 years of written history. The first version is known as the Old Kannada script. By about 3000 it had morphed into the Kannada and Telugu scripts. Printing presses introduced by Christian missionaries at the beginning of the 19th century standardized the Kannada and Telugu scripts.
The Kannada script is a type of writing system called an alphasyllabary. All consonants have a built-in vowel. Other vowels are indicated with diacritics, which appear next to the consonants. When they appear at the beginning of a syllable, vowels are written as separate letters. When consonants appear together without intervening vowels, the second consonant is written as a special joint symbol, usually below the first. The direction of writing: left to right in horizontal lines.
It has highest number of Janapeeta literary awards compared to any Indian language. Kannada had a huge boost during the Vijayanagar period. Shri Vinoba Bhave called "Kannada" script the "Queen of Kannada Scripts" not for all Language. "Vishwa Lipigala Raani".
1458
1461
1467
Arab League