Sometimes, dyspepsia is a more sudden, noticeable (acute) sensation. Depending on the cause of the dyspepsia, people may have other symptoms such as a poor appetite, nausea, constipation, diarrhea, flatulence, and belching. For some people, eating makes symptoms worse. For others, eating relieves symptoms.
An X-ray machine is essentially a camera. Instead of visible light, however, it uses X-rays to expose the film. X-rays are like light in that they are electromagnetic waves, but they are more energetic so they can penetrate many materials to varying degrees.
The wavelength of an X-ray however is one hundredth that of the light rays that you can see, at around 10Â¯Â¹Âºm. This means that they have a lot more energy. X-ray fluorescence is the emission of X-rays from excited atoms produced by the impact of high-energy electrons, other particles or a primary beam of other X-rays.