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Sagot :
The bio stimulatory area of visible light, which stimulates cell growth, DNA synthesis, and cell adhesion, is generally recognized to have a wavelength of about 630 nm. Both men and women can benefit from red light treatment with a 630nm wavelength because it is safe and effective for promoting hair growth.
According to one study, the light-activated the hair follicle's stem cells and propelled it into the anagen, or growth phase, of the hair cycle. Wavelength times frequency equals radiation speed for any wave phenomenon. Therefore, frequency equals wavelength times speed. The speed of light in a vacuum is 3e8 m/s.Thus, the frequency of light having a 630 nm wavelength is 3e8 / 630e-9.
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