Because of visible light! They have a wavelength of 7.5 x 10^–7 m to 4 x 10^7 m, and a frequency of 4 x 10^14 Hz to 7.5 x 10^14 Hz!
Do any of you know why you can see different colors of the shapes on top of the board?
They are used in fiber optic communications, colors that the human eye can see, electronic devices, etc. But they can also damage our retina, if the light is too intense.
I love sunbathing; it feels great! But the UV radiation from the sun can damage and age my skin cells...Hopefully my suit and I won't die :))
With a wavelength of 10^–8 m and a frequency of 10^16 Hz, they can kill bacteria, purify water, and be used in phototherapy!
How are the medical images of my body taken? By using X-rays and Gamma rays!
But they are very dangerous! X-rays have a wavelength of 10^–10 m and a frequency of 10^18 Hz; gamma rays have a wavelength of 10^–12 m and a frequency of 10^20 Hz!!!They can damage cells inside the body by causing dangerous ionization, leading to DNA damage and cancer :(((
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