Задача id12111

Two flat charged metal plates are placed parallel at a distance of 1 cm in a vacuum. The voltage between the plates is 10 V. The negatively charged plate is illuminated by a narrow beam of light, the wavelength of which is 1.3 x 10-7 m. Determine the radius of the circle on the surface of the positively charged plate that limits the area of impact of the photoelectrons. The red limit of the photoelectric effect from the surface of the plate is 3.3 x 10-7 m.

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