Fun Questions and Interesting Answers!
When did the person use electricity for the first time?
Today, we can hardly imagine life without electricity. However, people started to use electricity only since 1800. That year was Alessandro Volta invented the first battery and thus gave the world the first permanent and reliable source of electrical current. Soon it was discovered that electricity can be used to create heat and light. Volta’s discovery was a big step forward. It has enabled the use of many technical novelties that were not applicable to previously known devices for electricity production.
How did Archimedes’s law arise?
Archimedes was a mathematician and inventor living in the ancient Greek colony Syracuse, on the island of Sicily. King of Syracuse asked one day from Archimedes to tell him if there are silver in the golden royal crown. Archimedes has been struggling for a long time around this problem. One day, resting in the bath, he noticed the water level raised when he entered the bath. Immediately ran out of the bathroom and rushed through the streets of Syracuse, shouting, “EUREKA” (I’ve found out). Archimedes has solved the problem. He first measured how much the crown was heavy. Then he found a pile of gold and a pile of silver that they weighted same as the crown.
Then he lowered the crown into the court with water and figured out how much the water level was rising. That’s the same
done with the gold plum. If the crown was of pure gold, the water would rise to the same heights. However, there was a difference, so Archimedes, having had a lump of silver, could determine the exact difference between these two metals. Archimedes’s law or law specific weight says that every object submerged in liquidity is suppressed by the force that is
equal to the severity of liquid flow.
Why does the ice float in the water?
The ice is solid, and the water is liquid. When the temperature is low enough, the water turns into ice. When freezing, the water is spreading considerably. Of 10 l of water, 11 l of solid ice is obtained. The objects swim or tone according to the law first discovered by Archimedes, a Greek mathematician from III before the new era. This law, known as the “Archimedes’s Law,” says that every body soaking in liquidity loses its weight as much as the weight weighs it down liquids. That’s why about 9/10 of the iceberg lies under water.
Why are the colors of the colors so arranged?
Usually, for daylight, we say it is “white” and we call it white light or sunlight. This light, however, is a mixture of colors. When the sun’s light falls on the edge of the mirror or on the edge of the glass prism, or on the surface of the soap bubble – we see colors in that light. White light is split into different wavelengths, which we see as red, orange, yellow, green, blue, purple. These wavelengths create a bridle of parallel lines, so that each color gradually shifts to the next. This tie is called “specter”. In it the red color is always at the beginning, and blue and purple in the end.
This arrangement is due to different wavelengths of these colors. Rainbow colors are colors of the spectrum. In fact, the long semicircular spectrum (the rainbow) that was created by the decomposition of the Sun’s light. When the sun’s light enters the drops of water, it breaks up in it as if it falls on a glass prism. So in the water drop itself, we see various colors that go from one end to another. A part of this colored light is reflected in a drop and comes out again. Light comes out of the drop at various angles, depending on the color. And when looking at these colors in the long, it is seen that they are so arranged that the red is on the top, and purple at the bottom of the rainbow spectrum.
Laser Cooling possible?
In 1848, Lord Kelvin designed a temperature scale, he stated that there could not be a temperature lower than the absolute zero. It represents the theoretical state in which the particles of matter do not have any kinetic energy and the increase in temperature represents an increase in the mean value of the energy of movement of all the particles. How then is it possible for any particle to find a negative temperature in Kelvin?
How did Dr. Schneider and his team succeed in doing so? As a system they used ultrasonic gas at a potassium atom, at a temperature just above the absolute zero, in a vacuum. Using lasers and magnetic fields, they put atoms in a grid in which they mutually reject. This is a system at a basic energy level, at a very low temperature. Vacuum serves to ensure that the entire system is energetically isolated from the environment.
The scientists then quickly set the magnetic field so that the particles are attracted to each other instead of being rejected. That is, they are brought from a low energy state to a high energy state before they are able to react. With positive temperature this jump would be very unstable and the atoms would attract each other. However, the laser system allocates energy so that the atoms remain in place. As a result, the gas atom passes from the state with the temperature above the absolute zero to a state of one billionth of Kelvin below the absolute zero.