Which of the following statements about the electromagnetic spectrum is true? Explain your reasoning.

(a) X-rays travel faster than infrared radiation because they have higher energy.

(b) The wavelength of visible radiation decreases as its color changes from blue to green.

(c) The frequency of infrared radiation, which has a wavelength of 1.0 * 10³ nm, is half that of radio waves, which have a wavelength of 1.0 * 10⁶ nm.

(d) The frequency of infrared radiation, which has a wavelength of 1.0 * 10³ nm, is twice that of radio waves, which have a wavelength of 1.0 * 10⁶ nm.