From the examiner's notebook

37

maximums. The Linneys we obtained are called hyperbolas by mathematicians *).

Now it is completely clear why the distance between the maxima on the line connecting the sources is equal to half the wavelength. Indeed, at the midpoint of this wavelength, the waves arrive in the same phase and reinforce each other. If you move half a wavelength from this point, then the path of one wave will increase by half the wavelength, and the path of the other will decrease by the same amount. The path difference between the waves at this point (the difference in the path traveled by the waves from the sources to the point) will be equal to one wavelength, and the waves will again be mutually amplified, etc., through each wavelength.

The maximum corresponding to zero path difference is called zero maximum or zero order interference. Maxima with a path difference of one wavelength are maxima of the first order of interference, etc. The maximum order of interference is determined by an integer close to 2d/λ, where d is the distance between the sources and λ is the wavelength. Now try to analyze it yourself using a drawing, and maybe check experimentally how the picture will change if one of the sources emits waves delayed by half the period or some other part of it. What if the shift between oscillations changes randomly? To experimentally implement waves with a phase shift, it is enough to make the ends of the fork of different lengths.

*) A hyperbola is the locus of points, the difference in distances from which to two points (foci) is constructed.

From the examiner’s notebook

An X-ray tube consists of a glass balloon filled with vacuum.

Light sources are divided into two camps: natural and artificial.

The unit of frequency, the hertz, is named after the scientist who discovered this unit.

Inductance is measured in hens.

The further the object is from the lens, the more real the image will be; the closer, the smaller.

Lenses can be double-convex or single-convex.

The atom is complex and it fooled scientists for a long time.

All objects around us: tables, chairs, etc. press on us with a force equal to their weight.

Normal people have good vision, both near and at a distance.

Gamma rays are highly penetrating.

Saturated vapors differ from unsaturated ones in that they have already been saturated.

The red beam is the longest, and the violet beam is the shortest.

Angular velocity is expressed in omegas.