Петрушин Дмитрий Валерьевич

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There are many properties that man has found useful in his application of electromagnetic waves.
2. The flow of electrons in one direction results in an electric current.
3. The energy sources of the world are decreasing while the energy needs of the world are increasing.
b) 1. The isotopes of the element hydrogen were given individual names.
2. Electronics is usually thought of as that part of electricity which deals with vacuum tubes and translators.
3. The behaviour of metals is greatly affected by the changes in temperature.