The frequency of a given region of the electromagnetic spectrum ranges from
4 × 1014 to 7.5 × 1014 hz. the speed of light is 2.998 × 108 m/s. which waves are found in this region?

The ranges given are 4 × 10^14 to 7.5 × 10^14 Hz. At these frequencies, visible light type of waves are found in this region. This occurs at a wavelength of 400 - 700 nanometers and a color of violet through red. Outside this range, the naked eye cannot see the waves.

B. a graduated substance

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