13. High-frequency electromagnetic fields are typically used in medicine to heat internal tissues or organs of the body, such as in surgical cutting. For microwaves with a frequency of Hz, what is their wavelength? Can they be seen with the naked eye? [speed of light is 3×108 m/s]
(A) m; invisible
(B) m; visible
(C) m; invisible
(D) m; visible
(E)m; invisible

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統計: A(3), B(0), C(0), D(0), E(0) #3421208

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