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Physics 16 Online
OpenStudy (anonymous):

You are a scientist trying to develop a technology that can be used to power wrist watches. Which type of electromagnetic wave would be most useful to investigate? Gamma rays, because they are powerful and safe. Infrared waves, because they do not produce heat and have high energy. Ultraviolet waves, because they have moderate energy and are abundant. Microwaves, because they are powerful and available.

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