Final answer:
While historically Canon and Nikon have been camera market leaders, the rise of smartphone photography has changed the market. Moreover, the U.S. does not have higher voter turnout than many other democracies, including Sweden and South Korea. Lastly, visible light is not the only radiation capable of causing the photoelectric effect as ultraviolet rays can too.
Step-by-step explanation:
Regarding the question of whether Canon and Nikon sell more cameras than anyone else, the claim would require up-to-date market data for a definitive answer, and it is a consumer behavior and business question. However, historically, Canon and Nikon have been among the market leaders in the camera industry. As of my knowledge cutoff date in 2023, recent trends have shown that other brands, especially smartphone companies, have been dominating the camera market as many consumers shift to using smartphones for photography.
As to whether voting rates are higher in the United States than in most democratic industrialized countries, including Sweden and South Korea, this is false. Data from various international organizations shows that the U.S. often has a lower voter turnout compared to many other democracies.
The statement that visible light is the only type of electromagnetic radiation that can cause the photoelectric effect is also false. Ultraviolet and other higher frequency radiations can also cause the photoelectric effect. The concept of the photoelectric effect is an important principle in the field of physics.