Electromagnetic radiation with a wavelength of 725 nm
Electromagnetic radiation with a wavelength of 725 nm appears as red light to the human eye. The frequency of this light is __________ .2.18 ×4.14 ×4.14 ×2.18 ×2.42 ×
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Electromagnetic radiation with a wavelength of 725 nm appears as red light to the human eye. The frequency of this light is
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