X-ray

X-rays are a type of electromagnetic radiation.
Electromagnetic radiation can have many different wavelengths. For a particular range of wavelengths we get visible light, for another range we get ultraviolet, and for yet another we get infrared, and so on.

X-rays correspond to a particular range that is not visible to us, but happens to be really useful for many imaging applications. Radiation of this wavelength tends to pass through human soft tissue, but is blocked (in scientific parlance, is "attenuated") by hard tissue like bone, which is why medical X-rays work. When you get an X-ray scan, the image you are looking at is the shadow casted by your bones, in the same way as your body casts a visible shadow from sunlight.X- rays are electromagnetic radiations just like visible light, but with high energy/short wavelength or high frequency. They also travel with speed of light. In simple words these are photons with high energy.

THE MOST AMAZING FACT IS "
X-RAYS ARE ELECTRICALLY NEUTRAL BUT PRODUCE AN ELECTRIC FIELD AND MAGNETIC FIELD WHEN THEY PROPAGATE. 

X-ray is dangerous ? 

• Because X rays can kill living cells.
• When improperly used they can cause severe burns, cancer, leukemia, and cataracts
• They can speed aging.
• They can reduce immunity to disease.
• They can bring about disastrous changes in the reproductive cells.
• The effect of X radiation is cumulative. That is, a number of minor doses over a number of years is equivalent to a large dose at one time.
• X-rays are high energy electromagnetic rays. They have a strong ability to ionize air or gas. When X-rays fall on Human body they break up the molecular bonds and produce H and OH free radicals. These free radicals are highly reactive and disturb the proteins which are vital to health.
• Ionizing radiation damages DNA sometimes.

Discovery of X-ray 

Although Wilhelm Rontgen is traditionally credited with the discovery and first documentation of the properties of x-rays in 1895 there is good reason to believe they were actually produced and recorded some years earlier in 1890 by the American physicist, Arthur Goodspeed. While he was playing with a Ruhmkorff coil and spark gap he generated sufficient x-rays to fog a photographic plate, but he did not make the connection between the two events at the time.