Control №2 on Physics, option 4

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Uploaded: 22.09.2013
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1. Angular resolution limit of 5 minutes of arc. How many times lower visual acuity compared to the norm?
2. The rate of propagation of the beam of yellow light in the water 225 OOO km / s, and in the glass -198 200 km / s. Determine the refractive index of the glass relative to the water.
3. electron work function of 2.5 eV lithium. Will the photoelectric effect when illuminated by monochromatic light lithium with a wavelength of 50 nm?
4. X-ray soft tissue contrast agents are used (e.g., barium sulfate). Determine the mass attenuation coefficient of barium sulfate. Assume that the absorption of X-rays does not depend on in which the compound contains an atom in the absorber material.
5. Calculate the number of cores 130 I, decayed within the first day if the initial number of nuclei October 22
6. A beam of monochromatic light passes through the glass plate 1 cm thick. Identify
monochromatic natural absorption rate and the monochromatic absorption coefficient of glass, if it is absorbed 0.1 of the incident light. What should be the thickness of the glass plate to absorb the half of the incident light?

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