What part of the electromagnetic spectrum is invisible to the human eye and has the longest wavelength?

Answer 1

Light in the range of 390-700 nanometers (roughly 430-790 terahertz) is visible to most humans. This is in the top third of the EM spectrum roughly between the near ultraviolet and near infrared range.

So, the nonvisible portion of the spectrum is comprised of gamma rays, x-rays, extreme ultraviolet, most of the near infrared range, mid and full infrared, EHF, SHF, UHF, VHF, HF, MF, LF, VLF, voice frequency, SLF, and VLF.

Answer 2

The visible spectrum (visible light) has infrared (IR) light below it (lower frequency) that we cannot see. It also has ultraviolet (UV) light (higher frequency) above it that we cannot see. There is a whole range of the electromagnetic (EM) spectrum that we cannot see below IR, and that includes all the radio waves. Above the UV is x-ray and cosmic ray radiation, and we can't see that, either.

Use the link (provided) to the Wikipedia article on the EM spectrum and have a look at all the stuff you can't see and where it is on the spectrum relative to what you can see.

Answer 3

Any electromagnetic wave with a wavelength less than approximately 400 nm or greater than approximately 700 nm is invisible.

Answer 4

Any region which is not part of Visible Light. Therefore; Radio, Microwaves, Infra-red, Ultraviolet, X-rays, and Gamma.

Answer 5

Balamer series having wave length 4000 to 6500 A'

Answer 6

there is visible light on the spectrum and all the others are invisible

Answer 7

Radio