PHYS1171 Lecture Notes - Lecture 13: Radioactive Decay, Positron, Photon
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In ct scans, x-rays are produced by an x-ray source outside the body: they are shone through the body and detected on the other side just like x-ray imaging, however in a. Quiz: pet and ct both provide more specific information about the body than a single projection could. False: the detectors in pet and ct both detect photons. False: when an electron and positron annihilate each other, energy is given off as a single photon. The system of the compass and the earth"s magnetic field have the lowest energy: we can create an electromagnet by making electric current flow around in a loop. Quiz: an electric charge moving around in a circle in a clockwise direction creates a magnetic field. The same charge moving around in the same circle in an anticlockwise direction would create the same magnetic field.