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Определите функцию it и переведите предложения на русский язык:

1. When a ray of any kind strikes an atom, it may knock an electron out of the atom.
2. It is the voltmeter that is an instrument to be used for measuring the potential differ­ence between any two points in a circuit.
3. Atomic nuclei are, it is now believed, made up of two kinds of fundamental particles, protons and neutrons.
4. It is one of the inert gases and is monoatomic.
5. Another field containing three acres is added to it.
6. When the electron is by any means torn away from the hydrogen atom, the nucleus alone re­mains with a single positive charge of electricity on it.
7. It is the purpose of the present section to give an exhaustive treatment of the subject.
8. It is not the sound of the voice hat travels over the wire when we talk over a telephone.
9. It is necessary that the heat developed should be used by conducting the hot air to a gas turbine.
10. It took an incredible time in cutting down some of the largest timber trees.