A monochromatic point source illuminates a small photocathode. At distance r, the saturation current is 180 μA. The photocathode has work function 2.0 eV and the incident wavelength is 400 nm. The photocathode is then moved to distance 3r without changing the source. Take hc = 1240 eV·nm. Which pair gives the new saturation current and the stopping potential?
Physics · Photoelectric effect and dual nature of matter · question based on photoelectric effect
A monochromatic point source illuminates a small photocathode. At distance r, the saturation current is 180 μA. The photocathode has work function 2.0 eV and the incident wavelength is 400 nm. The photocathode is then moved to distance 3r without changing the source. Take hc = 1240 eV·nm. Which pair gives the new saturation current and the stopping potential?
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