I need some good websites or imfoermation that introduce me "what is electromagetic spectrum" and "what does X-Rays do"?
plz help,,,,thank you very much~
2007-03-27 21:58:11 · 3 answers · asked by annabinhai 1 in Science & Mathematics ➔ Chemistry
The electromagnetic spectrum is a group of transverse waves that travel at the speed of light. They include: cosmic, gamma, Xray, ultraviolet, visible light, infrared, heat, microwave, radio wave, tv, electric wave.(fromlargest to smallest frequency, or stated the other way, from smallest to largest wavelength.
Xrays are high frequency, small wavelength. They go through the body, but can be used to see hard tissues like bones. Try to Google Xrays for more info on them.
2007-03-28 05:04:49 · answer #1 · answered by science teacher 7 · 0⤊ 0⤋
The electromagnetic spectrum extends from large radio waves through microwaves, infrared, visible light, ultraviolet, x-rays and gamma rays and beyond. The wave length decreases, the frequency and the energy increases as we go from radio waves to microwaves, visible light and x-rays etc.
All electromagnetic radiation can travel through vacuum and thus space, helping us to communicate with satellites.
What do X-rays do? they can pass through objects which are opaque to visible light, because of their higher frequency and consequent higher energy. They are also ionising and cause blackening of the photographic film. Thus they are used in medicine to look at structures within the human body (bones present good shadows to x-rays), industrial nondestructive testing to detect discontinuities like cracks etc. X-rays are also used to determine the crystal structures and chemical composition of many materials. Because they can pass through opaque objects, X-rays are extensively used in the security systems at airports etc.
Since they are ionising and can thus cause damage to our tissues, X-rays need to be handled with care and very high energy x-rays are used in treatment of cancers. Unlike radioactive isotopes, which need caution even for storage, X-ray equipment is safe (from radiation point of view) when not in use.
2007-03-28 05:17:29 · answer #2 · answered by Swamy 7 · 0⤊ 0⤋
As always, Wikipedia is a good place to start
2007-03-28 05:01:52 · answer #3 · answered by dudara 4 · 0⤊ 0⤋