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# Description

1.Elektron with an energy of 100 eV is close to infinity along the power line to a charged metal ball (charge Q = 10 nC, the radius R = 10 cm.) Find the minimum distance at which the electron approaches the ball.
2.Provodnik length ℓ = 3,14 dm aluminum (ρ = 2,5.10-8 Ohm .m) is bent into a ring. The voltage at the ends of the conductor U = 0,004 V. Find the magnetic induction at the center of the ring, conductor cross section S = 1 mm2.
3.Kvadratnaya frame with side a = 20 cm, comprising 300 turns of wire rotates uniformly around the axis of symmetry perpendicular to the field lines of the homogeneous magnetic field. Volumetric energy density of the field w = 20 J / m3. Find the maximum value of induced emf frame at a rotational speed w = 314c-1.
4.Opredelit wavelength of light used for observation of Newton's rings in transmitted light when the distance between the fifth and the twenty-fifth dark ring is 9mm. The radius of curvature of the lenses 15 m.
5.Krasnaya limit of the photoelectric effect for a certain metal is λ0 = A0 2750. Find the electron work function of the metal (in electron volts), the maximum kinetic energy and velocity of electrons ejected by radiation with a wavelength of 0.18 microns.
6. When natural light passing through the polarizer and the analyzer, its intensity is reduced by 6 times. Find losses in crystals, considering them equal, if the angle between the planes of polarization was 450.
7.Opredelit ε energy photon emitted when the electron in a hydrogen atom from the third to the first energy level.
8.Cherez screen consists of two panels: a lead thickness of 2 cm and 5 cm thick iron., Runs a narrow beam γ - rays with an energy of 3 MeV. To determine how many times to change the intensity of the γ - rays in passing through this screen.

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