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- Infrared is in the range of the EM spectrum between microwaves and visible light. IR has frequencies from about 30 THz up to about 400 THz and wavelengths of about 100 μm to 740 nanometers, or 0.00003 inches. IR light is invisible to human eyes, but we can feel it as heat if the intensity is sufficient.
- Visible light is found in the middle of the EM spectrum, between IR and UV. It has frequencies of about 400 THz to 800 THz and wavelengths of about 740 nm to 380 nm. More generally, visible light is defined as the wavelengths that are visible to most human eyes.
- Ultraviolet light is in the range of the EM spectrum between visible light and X-rays. It has frequencies of about 8 × 1014 to 3 × 1016 Hz and wavelengths of about 380 nm to about 10 nm UV light is a component of sunlight; however, it is invisible to the human eye. It has numerous medical and industrial applications, but it can damage living tissue.
- X-Ray are roughly classified into two types: soft X-rays and hard X-rays. Soft X-rays comprise the range of the EM spectrum between UV and gamma rays. Hard X-rays occupy the same region of the EM spectrum as gamma rays. The only difference between them is their source: X-rays are produced by accelerating electrons, while gamma rays are produced by atomic nuclei.
- Wow how did you learn that? you're so amazing!
- What's the last one?
- Gamma radiation causes damage to living tissue, which makes it useful for killing cancer cells when applied in carefully measured doses to small regions. Uncontrolled exposure, though, is extremely dangerous to humans.
- Gamma-rays are in the range of the spectrum above soft X-rays. Gamma-rays have frequencies greater than about 1018 Hz and wavelengths of less than 100 pm.
- Now, I understand EM waves to be honest I'm distracted when our professor discussing this. Thanks a lot Helen! You are the best
- There's no problem, just ask me if you have any questions. I'm glad you learned a lot. Hope you learned too.
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