Electromagnetic spectrum

                        Electromagnetic spectrum-->> 

--Electromagnetic spectrum is different type of radiation(X-rays, Gamma rays,  ultravoilet rays, infrared rays, microwaves) release from star including our own sun.

--Electromagnetic radiation travels in waves.

--Frequency described how many ways per second  wavelength producing.

--Wavalength measures the individual wave in meters.

--Scientist describe the electromagnetic spectrum as a long line at one in 'ly'.

--Radio with the longest wave length and lowest frequencies in the spectrum for example tower.

--A single radiation wave has a length of a football field.

--After radio wave, come micro wave which produce more energy due to shorter wavelengths and higher frequencies for example tv remote.

--Cellphone radar and microwaves ovens use microwaves.

--Next comes infrared light, the sun fire living creatures and other heat sources all produces infrared light.

--While we cannot see infrared light, we fill it as heat.

--Visible light occupies a narrow slice of the electromagnetic spectrum nestled between infrared and untravoilet light.

-- Red(lenth 700nm) wavelengths have the lowest frequencies and longest wavelength of visible light.

-- As you move from red through orange(620nm), yellow(580nm), green(530nm), blue(475nm), and finally voilet(400nm) wavelength shorten and frequency increases.

--From visible voilet light we move into ultravoilet frequencies.

--Human skin produces vitamin D when exposed to ultravoilet light but exessive ultravoilet light cuases subburns.

--Next X-rays which pass through salt issue but not denser materials such as bone making them valuable for medical x-rays.

--Also have security application such as airport baggage checks.

--Gamma rays produce even shorter wavelengths higher frequencies and more energy in comparison to the football-field-sized wavelengths of radio waves

--Gamma rays waves are small as atom nuclie.

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