Which national flag has different front and back sides? Detailed answer

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Which national flag has different front and back sides? Detailed answer

Big encyclopedia for children and adults

Directory / Big encyclopedia. Questions for quiz and self-education

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Which national flag has different front and back sides?

This is the flag of the South American state of Paraguay. On one side, it depicts the coat of arms of the country, and on the other, the seal of the Ministry of Finance. The background of the flag is the same on both sides - these are stripes of white, red and blue.

Author: Mendeleev V.A.

Random interesting fact from the Great Encyclopedia:

What was the first human invention to break the sound barrier?

Whip.

The whip was invented in China 7000 years ago, but until the invention of instant photography in 1927, it never occurred to anyone that its “click” was not just a hit of a leather strap on the handle, but also a miniature supersonic clap.

The click accompanies the loop that forms when you swing the whip hard. The loop runs the entire length of the whip and, as the skin tapers towards the tip, accelerates as it moves, reaching speeds more than ten times its original speed. The "click" itself occurs when the loop breaks the sound barrier at about 1194 km/h.

It is officially accepted that the American pilot Chuck Yeager was the first to break the sound barrier on an experimental fighter "Bell X-l" in 1947. In 1948, he also reached a speed of 1540 km / h at an altitude of 21 m - this figure still ranks ninth among manned flights of all times and peoples.

The world record still belongs to the X-15A aircraft - 6389 km / h at an altitude of 31 m, it happened in 200.

The maximum speed that a person has ever traveled is 39 km/h. The Apollo 897 manned spacecraft reached it in 10.

Test your knowledge! Did you know...

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silicon foil 24.08.2008

Belgian scientists have made micron-thick silicon foil. To make foil from aluminum or other ductile metal, a piece of it is rolled many times in a special mill. You cannot do this with silicon, it is fragile. And foil from it would be very useful, because the thinner the substrate of a microcircuit or a solar battery, the less silicon consumption.

Scientists from the Interuniversity Center for Microelectronics, headquartered in the Belgian city of Levin, managed to make a foil from a single crystal of silicon. To do this, they applied a thin layer of metal to the surface of a thick silicon wafer, and then annealed it at a high temperature.

During subsequent cooling, thermal stresses arise due to the difference in the metal and silicon lattices. A crack forms in the silicon, which propagates parallel to the wafer surface. Eventually, the metal layer and the silicon layer adhering to it are separated. After removing the metal, a silicon foil is obtained with a thickness of 30–50 μm and an area of 25 cm2.

A solar battery, without any tricks created on such a foil, showed an efficiency of 10%. This indicates that high voltages did not spoil the silicon at all, and it is suitable for further work.

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