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Alpha particles of kinetic energy 6.9M V are incident at a rate of 3.1x 10" per second
on a copper foil of thickness 3.1 x 10-m. A circular detector of diameter 1.0cm is placed 13cm
from the foil at an angle of 30° with the direction of the incident alpha particles. At what rate
does the detector measure scattered alpha particles? (The molar mass of copper is 63.5 and
its density is 8.9em-)

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