A narrow beam of protons with kinetic energy of 100 keV padant normally on gold foil, which pd = 1.0 mg / cm ^ 2 (p - density, d - thickness). The protons scattered at an angle of 60 °, counter registers, input round hole which has an area of 1.0 cm ^ 2, and it is separated from the scattering foil section at a distance of 10 cm. The hole is oriented perpendicular to counter falling on him protons. What proportion of the scattered protons enters the opening of the counter?
Task 60415. Detailed recording solution formulas and the laws used in the decision, the withdrawal of the formula.
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