Task 3.8
In the oscillatory circuit, the maximum current is 0.2 A, and the maximum voltage on the plates
40 V capacitor. Find the energy of the oscillating circuit if the period of oscillation is 15.7 microseconds.
Task 3.18
What is the difference in phase of the oscillations of two points, if they are separated from each other by a distance of 3 m and
Lie on a straight line perpendicular to the front of the wave. The wave propagation velocity is 600 m / s, and the period
Vibrations of 0.02 s.
Task 3.28
Newton's rings are formed between a flat glass and a lens with a radius of curvature of 10 m.
Monochromatic light falls normally. The diameter of the third light ring in reflected light is
8 mm. Find the wavelength of the incident light.
Task 3.38
What difference in wavelengths of orange rays (? = 0.6 microns) can resolve the diffraction grating
Width of 3 cm and a period of 9 μm in the spectrum of the third order?

Task 3.48
Natural light passes through two polarizers, the angle between the main planes of which is 30 °. In
how many times. The intensity of the light passed through this system will change if the angle between the planes
Polarizers increase by half?
Task 3.58
Determine the thickness of the layer of matter that attenuates the intensity of monochromatic light by three times,
If the thickness of the half-attenuation layer is 2 m.
Task 3.68
Light with a wavelength of 0.5 μm normally falls on the mirror surface and produces pressure on it
4 μPa. Determine the number of photons incident per second on 1 cm2 of this surface.
Task 3.78
A gamma-photon with an energy of 1.02 MeV as a result of Compton scattering by a free electron
Deviated from the original direction by an angle of 90 °. Determine the kinetic energy and momentum
The recoil electron. Before the collision, the electron rested.