4. Translate the following sentences into Russian paying attention to the Objective with the Infinitive Construction:

1. We know an alternating current to be continually changing.

2. We know them to get the experimental information on masses and decay properties of these particles.

3. They expected magnetic moments, electromagnetic mass differences and relative rates of various weak decay processes to tell them something about the structure of the strongly interacting particles.

4. These experiments enable us to test elementary particles.

5. We consider these experimental investigations to be very complicated.

6. We know the weak interactions to be responsible for the slow decays of elementary particles such as beta decay, pi-meson and mu-meson decay.

7. Newton considered light to consist of very tiny particles-corpuscles.

8. One expects most of the parameters to be constants and the others to vary smoothly with energy.

9. We shall consider the core to be inert, and we will allow the particles to populate all states of the open shell.

10. The effect on the single particles is, as we have mentioned before, to cause them to localize in one of the partial regions.

5. Translate into Russian paying attention to the infinitive constructions:

1. The number of alpha particles is known to have been counted by Rutherford and Geiger.

2. The total charge is known to have been determined with the special apparatus.

3. The alpha particle is considered to lose its velocity as it passes through matter.

4. Repeated attempts were made to detect the neutrino and obtain more information about its nature.

5. The experiments of Rutherford on the scattering of alpha particles by a variety of elements are known to have led to the discovery of the atomic nucleus.

6. We know cosmic rays to travel in space outside the earth's atmosphere at speeds nearly equal to that of light. Some of them happen to approach the earth and enter the atmosphere.

7. The term "cosmic rays" is used to refer both to the primary and secondary rays.

8. We know many types of electronic computers to be used in scientific research laboratories.

9. We consider all the bodies to consist of atoms.

10. We know hydrogen to have a single electron.

11. The helium atom is known to have two electrons revolving around the nucleus. 12. The hydrogen atom is supposed to be the simplest of all atoms.

13. The gamma rays proved to be true waves like X-rays, but of much shorter wavelength.

14. The beta rays were found to consist of negative electrons.

15. But alpha rays turned out to be the greatest surprise. The alpha rays proved to be charged electrically with a positive charge. They were heavier than the negative electrons which composed the beta rays.

16. When these "alpha particles", as they later were called, were collected and analysed with the aid of the spectroscope, they turned out to be helium gas.

17. In other words, the atoms of radium were shown by Rutherford's experiments to be giving off atoms of helium.