Electromagnetic radiation with a wavelength of 700 nm would be:

a)x-rays
b)red light
c)violet light
d)ultraviolet light
e)microwaves

I thought it would be visible light but that's not an option.

Red and violet are both visible. Red would fit.

Color Frequency Wavelength
violet 668–789 THz 380–450 nm
blue 631–668 THz 450–475 nm
cyan 606–630 THz 476–495 nm
green 526–606 THz 495–570 nm
yellow 508–526 THz 570–590 nm
orange 484–508 THz 590–620 nm
red 400–484 THz 620–750 nm

Electromagnetic radiation with a wavelength of 700 nm falls within the range of visible light. The answer choice that corresponds to visible light is "b) red light." So, in this case, the correct answer would be "b) red light."

To determine the nature of electromagnetic radiation with a wavelength of 700 nm, it is helpful to understand the electromagnetic spectrum. The electromagnetic spectrum spans a range of different wavelengths, including radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.

Visible light, which is the portion of the spectrum that human eyes can detect, ranges from approximately 400 nm to 700 nm. Red light specifically falls on the longer end of the visible light spectrum.

Given that the wavelength in question is 700 nm, it falls within the range of visible light. Therefore, the correct answer would be (b) red light. It is important to note that the other options provided are incorrect because they correspond to different regions of the electromagnetic spectrum, such as X-rays, ultraviolet light, and microwaves, which have significantly shorter or longer wavelengths compared to the one provided.