An X-ray is a quick and painless procedure commonly used to produce images of the inside of the body. It's a very effective way of looking at the bones and can be used to help detect a range of conditions.-rays can be used to examine most areas of the body. They're mainly used to look at the bones and joints, although they're sometimes used to detect problems affecting soft tissue, such as internal organs. Problems that may be detected during an X-ray include: 1  bone fractures and breaks.
Spectrometer, Spectroscope, and Spectrograph. A spectrometer is any instrument used to probe a property of light as a function of its portion of the electromagnetic spectrum, typically its wavelength, frequency, or energy. The property being measured is usually intensity of light, but other variables like polarization can also be measured.
The polygraph or simply called lie detector is commonly used in police investigation especially in the United States such as FBI, CIA, and other federal and state governments including private entities for at least 60 years. The lie detector uses the galvanic skin response to determine if the subject is lying or not.nother clear example is that when a person is experiencing a certain emotion like fear, the sweat glands secrete more fluid that makes electric current to flow easily. As such, GSR results are commonly used for relaxation training.