8. Translate into Russian paying attention to the infinitive constructions:
The motion took place long enough for the bodies to become heated.
Here is one more important point for the speaker to explain.
For a reaction to take place, an A molecule must first meet a B molecule.
The accuracy of the lunar and solar theories is not sufficient for them to be significant.
The lithium nucleus is too small for so many collisions to occur.
There is no reason for the conversion of mechanical energy into radiant energy to be continuous.
The speed of particles is a bit too swift for us to study them in detail.
Quarks had to have half-integral spin for the model to work.
At low energies cross sections become larger, partly because there is more time for the forces to act with slower moving particles.
Most of these newly discovered particles have too short lifetime for them to be able to combine with electrons.
The time required for the electron cloud to pass from the rod to the cylinder was about ten times greater than the half-period of the field.
For the current to increase with time additional electrons must be induced in a semiconductor.
The interval was less than the time taken for a signal to travel from one particle to the other at the two measurement positions.
Bohr modified his formula for the hydrogen atom to fit the helium atom by doubling the charge on the nucleus.
9. Translate into Russian paying attention to the infinitive:
Since the whole of the mass of the atom resides in the nucleus, a-rays must originate from the nucleus of the atom.
At first it appears possible for the β-particles to originate either in the extra-nuclear structure or to consist of nuclear electrons.
Now the radioactive element which results from a p-ray transition in radioactive decay is found to occupy a position in the periodic table with Z one unit higher than the parent element.
Hence the a-ray must have originated from the nucleus so as to increase the effective positive charge of the latter by one unit.
To examine the accuracy of this approximation, we have also applied this technique to hydrogen.
In order to clearly separate dynamic effects the method is applied to positron scattering by atomic hydrogen.
The specific charge of an a-particle was found to be almost exactly half that of a proton.
The next step was to find the charge by an independent method.
To find the charge per particle it is necessary to know the number of particles emitted per second.
The positive charge on each a-particle was found to be twice as great as the charge on an electron or proton so that, since its specific charge is half that of a proton the mass of an a-particle must be four times the mass of a proton.
Neutrons were found to be emitted when beryllium or boron was bombarded with a-particles.
The theory developed here, using these energy-level schemes, can be applied to either ionic or molecular systems.