Предмет: Физика, автор: Аноним

узнайте частоту свободных електромагнитных колебаний контура з конденсатом на 0,3 мкФ и котушки индуктивности 0,3 Гн

Ответы

Автор ответа: naf52NAF

v=1/T=1/2π√LC
v=1/6,28*√0,3*0,3*10⁻⁶=1/6,28*0,3*10⁻³
v=1000/1,9=526 Гц

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Christmas in Britain
Christmas Day, December 25, is probably the most popular holiday in Great Britain. It is a family holiday. Traditionally all relatives and friends give each other presents. So before Christmas all the department stores and shops are crowded, everybody is choosing a present. In general, people get prepared for this holiday very carefully. They decorate their houses in the traditional way, that is the Christmas trees are set up in houses, in the streets and churches. The Christmas trees are always decorated with fairy lights, angels and small toys. In addition little packets with nuts, candies and special biscuits are hung on the tree. Presents are put around the tree and artificial ''frost'' is scattered over the branches.
The Germans are believed to be the first to use the Christmas tree in their celebrations, and Martin Luther was the first to place a star on the top of the tree. This star represents the star that appeared over the stable in which Christ was born.
In Great Britain the Christmas tree became popular when Queen Victoria used it.
Besides the Christmas tree, holly and mistletoe are used to decorate the house.
Branches of holly are put up behind pictures and mistletoe is hung over doors, so the young people have a chance to kiss the girls under it, plucking each time a red berry from the mistletoe. It is said that the girl who was not kissed under it at Christmas would not get married that year.
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Santa Claus got his name from a man known as St. Nicholas who lived in Asia in the fourth century. He gave his wealth to the poor and often to children. After he died the Dutch brought this legend to colonial America. Soon the Dutch name Sinter Klaus became Santa Claus.
Carol singing is an essential part of Christmas. No church or school is without its carol service. Carols may be traditional or by known composers they can express different feelings. Carols appeared in Christmas history about the fifteenth century.
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Usually a coin or two are hidden inside the pudding and part of the fun is to see who finds it.
After the lunch they go to the sitting room to listen to the Christmas speech of the Queen, shown on TV.
So Christmas is a merry family holiday for all the people of Great Britain.

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