Fizika 380-350 and 48-55

380.Compare the speed of propagation of red and violet rays in a vacuum.

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379.Specify the necessary condition for wave interference.

• non-coherence of waves

• not monochromatic waves

• presence of only light wave

• wave coherence

• none of the answers is correct

378. Light of wavelength 0.5 µm is normally incident on a diffraction grating. The grating period is 2 µm. What is the highest order of the spectrum that can be observed using this grating?

• 2

• 3

• 4

• 5

• 6

377. If a plane wave falls on an obstacle, and the diffraction pattern is observed on a screen located in the focal plane of a collecting lens installed in the path of light passing through the obstacle, then this is:

• Fresnel diffraction

• diffraction by a spatial grating

• light dispersion

• light polarization

• Fraunhofer diffraction

Specify Malus's law.

• 2,34*10^-7

• tg ibr=n21

• I = I₀(cosα)^2

• 2,34*10^-18

• 2,34*10^8

375.Compare the speed of propagation of red and violet rays in water.

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374. A device that converts natural light into plane-polarized light is called:

• polarizer

• spectrometer

• interferometer

• diffraction grating

• ammeter

373. A device used to determine the degree of polarization of light is called:

• spectrometer

• interferometer

• diffraction grating

• polarizer

• analyzer

372. The radio transmitter of the “Vostok” satellite ship operated at a frequency of 20 MHz. What is the wavelength it emitted? (c = 3 * 10^8 m/s)

• 2/3 m

• 3/2 m

• 0,15 m

• 2/ 30 m

• 15 m

370.The figure shows the wave profile at a certain point in time. What is its wavelength?

• 4 m

• 0.2 m

• 1 m

• 0.4 m

• 12 m