(B) The electromagnetic spectrum is arranged in order of increasing frequency and decreasing wavelength as follows: $Radio \ waves > \text{Microwaves}

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(B) The electromagnetic spectrum is arranged in order of increasing frequency and decreasing wavelength as follows: $Radio \ waves > \text{Microwaves} > \text{Infrared} > \text{Visible} > \text{Ultraviolet} > X\text{-rays} > \text{Gamma rays}$.Among the given options,$Radio \ waves$ have the longest wavelength.